COA_INT as wrapper on lib.contentElementWithHeader for no_cache?

[simonhantha]

Hey guys,

my goal would be to disable cache for a specific (custom) content element on a page.

But if I try to wrap a lib.contentElementWithHeader with COA_INT I get the following exception:
Trying to access array offset on value of type null in /ext/headless/Classes/ContentObject/JsonContentContentObject.php line 146
-> $data['colPos' . $element['colPos']][] = $element;

That's probably because I get no values line 218
-> $tmpValue = $cObj->cObjGetSingle($renderObjName, $renderObjConf, $renderObjKey);

Currently the code with a custom element example (using ext mask) looks like the following combined with an answer from
https://stackoverflow.com/questions/57505896/typo3-howto-disable-cache-for-specific-content-element-on-a-page

file ts\ContentElements\mask_example.typoscript:

tt_content.mask_example =< lib.contentElementWithHeader
tt_content.mask_example {
fields {
content {
fields {
header = TEXT
header {
field = header
}
title = TEXT
title {
field = tx_mask_title
}
}
}
}
}

tmp.mask_example < tt_content.mask_example
tt_content.mask_example >
tt_content.mask_example = COA_INT
tt_content.mask_example {
10 < tmp.mask_example
10 =< lib.contentElementWithHeader
}

Can't I wrap the element in your opinion? Or should I modify the code in JsonContentContentObject?