XCP-ng Cneter 99.99.99.30 can't connect to old XenServer 7.0 build 125380c

[TheLumberJohn]

Today i was trying to cross-pool live-migrate VM's from old XenServer 7.0 node to newly deployed XCP-ng 8.2.1and i encountered the fact that i could not add the old node to the new nightly build (99.99.99.30) XCP-ng Center, while the XCP-ng Center version 20.04.01 allows me to do this.
I got this error:

 		Failed to connect to 192.168.232.5
Required property 'error' expects a non-null value. Path '', line 1, position 84.		Aug 16, 2024 2:31 PM	Dismiss

[Kiuman]

Hi, I'm exactly in the same situation, but my target ius XCP-ng 8.3. I tried with XCP-ng Center vNext Build 24307 (last version up to today's post) and tried live-migrate with last version of XOA but there the error was even stranger.
Did you find any solution to this?