Steps to reproduce the issue

Custom Fields have own filter options, when they are not changed, means when their setting is "Plugin-Settings" a WYSIWYG Editor filters out all html. Which does not make sense at all. The editor field should respect the set up Joomla Textfilters. It's ok to have deeper settings to, but the default should be the Joomla Textfilters...

Expected result

If you create for examplel an editor custom field the field should have the Joomla Textfilter as default

Actual result

If you create for example an editor custom field the field strips out all html by default

System information (as much as possible)

Joomla 3.9.18