File shared with federation does not open - "Call to a member function getUID() on null in file"

[Uatschitchun]

2 NC instances, both 29.0.7, set up as trusted federation shares.
Opening and editing office documents with collabora works fine. Even so shared .md files.

When trying to open a shared .drawio file I get:

{"reqId":"ZwV2nlESlB36spBPnygZtAAAAMk",
"level":3,"time":"2024-10-08T18:14:55+00:00",
"remoteAddr":"88.78.112.111",
"user":"ANON",
"app":"index",
"method":"GET",
"url":"/apps/drawio/ajax/load?fileId=18043&shareToken=",
"message":"Call to a member function getUID() on null in file '/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php' line 284",
"userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 OPR/114.0.0.0",
"version":"29.0.7.1",
"exception":{"Exception":"Exception",
"Message":"Call to a member function getUID() on null in file '/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php' line 284",
"Code":0,"Trace":[{"file":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/App.php",
"line":184,"function":"dispatch",
"class":"OC\\AppFramework\\Http\\Dispatcher",
"type":"->",
"args":[["OCA\\Drawio\\Controller\\EditorController"],"load"]},{"file":"/var/www/virtual/MYSERVER/html/lib/private/Route/Router.php",
"line":331,"function":"main",
"class":"OC\\AppFramework\\App",
"type":"::",
"args":["OCA\\Drawio\\Controller\\EditorController",
"load",["OC\\AppFramework\\DependencyInjection\\DIContainer"],["drawio.editor.load"]]},{"file":"/var/www/virtual/MYSERVER/html/lib/base.php",
"line":1058,"function":"match",
"class":"OC\\Route\\Router",
"type":"->",
"args":["/apps/drawio/ajax/load"]},{"file":"/var/www/virtual/MYSERVER/html/index.php",
"line":49,"function":"handleRequest",
"class":"OC",
"type":"::",
"args":[]}],"File":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/Http/Dispatcher.php",
"Line":170,"Previous":{"Exception":"Error",
"Message":"Call to a member function getUID() on null",
"Code":0,"Trace":[{"file":"/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php",
"line":245,"function":"loadInternal",
"class":"OCA\\Drawio\\Controller\\EditorController",
"type":"->",
"args":[18043,"",false]},{"file":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/Http/Dispatcher.php",
"line":232,"function":"load",
"class":"OCA\\Drawio\\Controller\\EditorController",
"type":"->",
"args":["18043",
""]},{"file":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/Http/Dispatcher.php",
"line":138,"function":"executeController",
"class":"OC\\AppFramework\\Http\\Dispatcher",
"type":"->",
"args":[["OCA\\Drawio\\Controller\\EditorController"],"load"]},{"file":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/App.php",
"line":184,"function":"dispatch",
"class":"OC\\AppFramework\\Http\\Dispatcher",
"type":"->",
"args":[["OCA\\Drawio\\Controller\\EditorController"],"load"]},{"file":"/var/www/virtual/MYSERVER/html/lib/private/Route/Router.php",
"line":331,"function":"main",
"class":"OC\\AppFramework\\App",
"type":"::",
"args":["OCA\\Drawio\\Controller\\EditorController",
"load",["OC\\AppFramework\\DependencyInjection\\DIContainer"],["drawio.editor.load"]]},{"file":"/var/www/virtual/MYSERVER/html/lib/base.php",
"line":1058,"function":"match",
"class":"OC\\Route\\Router",
"type":"->",
"args":["/apps/drawio/ajax/load"]},{"file":"/var/www/virtual/MYSERVER/html/index.php",
"line":49,"function":"handleRequest",
"class":"OC",
"type":"::",
"args":[]}],"File":"/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php",
"Line":284},"message":"Call to a member function getUID() on null in file '/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php' line 284",
"exception":{},"CustomMessage":"Call to a member function getUID() on null in file '/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php' line 284"}}

{"reqId":"ZwV2pBma3gT3sarxA0q-jgAAAA4",
"level":3,"time":"2024-10-08T18:15:00+00:00",
"remoteAddr":"88.78.112.111",
"user":"ANON",
"app":"index",
"method":"GET",
"url":"/apps/drawio/ajax/getFileInfo?fileId=18043&shareToken=",
"message":"Call to a member function getUID() on null in file '/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php' line 357",
"userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36 OPR/114.0.0.0",
"version":"29.0.7.1",
"exception":{"Exception":"Exception",
"Message":"Call to a member function getUID() on null in file '/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php' line 357",
"Code":0,"Trace":[{"file":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/App.php",
"line":184,"function":"dispatch",
"class":"OC\\AppFramework\\Http\\Dispatcher",
"type":"->",
"args":[["OCA\\Drawio\\Controller\\EditorController"],"getFileInfo"]},{"file":"/var/www/virtual/MYSERVER/html/lib/private/Route/Router.php",
"line":331,"function":"main",
"class":"OC\\AppFramework\\App",
"type":"::",
"args":["OCA\\Drawio\\Controller\\EditorController",
"getFileInfo",["OC\\AppFramework\\DependencyInjection\\DIContainer"],["drawio.editor.getfileinfo"]]},{"file":"/var/www/virtual/MYSERVER/html/lib/base.php",
"line":1058,"function":"match",
"class":"OC\\Route\\Router",
"type":"->",
"args":["/apps/drawio/ajax/getFileInfo"]},{"file":"/var/www/virtual/MYSERVER/html/index.php",
"line":49,"function":"handleRequest",
"class":"OC",
"type":"::",
"args":[]}],"File":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/Http/Dispatcher.php",
"Line":170,"Previous":{"Exception":"Error",
"Message":"Call to a member function getUID() on null",
"Code":0,"Trace":[{"file":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/Http/Dispatcher.php",
"line":232,"function":"getFileInfo",
"class":"OCA\\Drawio\\Controller\\EditorController",
"type":"->",
"args":["18043",
""]},{"file":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/Http/Dispatcher.php",
"line":138,"function":"executeController",
"class":"OC\\AppFramework\\Http\\Dispatcher",
"type":"->",
"args":[["OCA\\Drawio\\Controller\\EditorController"],"getFileInfo"]},{"file":"/var/www/virtual/MYSERVER/html/lib/private/AppFramework/App.php",
"line":184,"function":"dispatch",
"class":"OC\\AppFramework\\Http\\Dispatcher",
"type":"->",
"args":[["OCA\\Drawio\\Controller\\EditorController"],"getFileInfo"]},{"file":"/var/www/virtual/MYSERVER/html/lib/private/Route/Router.php",
"line":331,"function":"main",
"class":"OC\\AppFramework\\App",
"type":"::",
"args":["OCA\\Drawio\\Controller\\EditorController",
"getFileInfo",["OC\\AppFramework\\DependencyInjection\\DIContainer"],["drawio.editor.getfileinfo"]]},{"file":"/var/www/virtual/MYSERVER/html/lib/base.php",
"line":1058,"function":"match",
"class":"OC\\Route\\Router",
"type":"->",
"args":["/apps/drawio/ajax/getFileInfo"]},{"file":"/var/www/virtual/MYSERVER/html/index.php",
"line":49,"function":"handleRequest",
"class":"OC",
"type":"::",
"args":[]}],"File":"/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php",
"Line":357},"message":"Call to a member function getUID() on null in file '/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php' line 357",
"exception":{},"CustomMessage":"Call to a member function getUID() on null in file '/var/www/virtual/MYSERVER/html/apps/drawio/lib/Controller/EditorController.php' line 357"}}