No problems with Joomla! 3.9.6
Problems since Joomla! 3.9.8

Steps to reproduce the issue

1. Create Custom Field Type "Repeatable Field".
2. Use "Editor" and/or "Text-Area"-Fields as part of Repeatable-Field.
3. Type in HTML-Tags like < br > or < p >< /p > ...

Expected result

HTML-Tags are not filtered / deleted after saving.

Actual result

HTML-Tags are filtered / deleted after saving.

System information (as much as possible)

No problems with Joomla! 3.9.6
Problems since Joomla! 3.9.8

Additional comments

In plugin-settings I can set "Custom Field: Editor" and "Custom Field: Textera" to "unfiltered" or "safe HTML".

Those setting still work correctly with the CustomField "Editor" and CustomField "Texterea", but not with Custom Field "Repeatable->Editor" and/or "Repeatable->TextArea"