I have nested FormFragments, all 'hidden' on initial page load.
However, it also does so for the hidden (t:formdata) input-field of nested FormFragments, which triggers validation of FormFragments that are hidden in the browser, resulting in error messages for invisible validate=required-fields. It should only do this for input elements not under control of a nested FormFragment.
The same applies to disableInputFields, although that one now works because if the outer FormFragment becomes hidden all nested ones should be made hidden too.
Either this behaviour should be fixed, or nested FormFragments should not be allowed.
In addition, the FormFragment only cares about 'input' fields; textarea's should also be considered.