This sibling branch works:
Text content at position 27007:


There are text properties here:
  fontified            t
  isearch-open-invisible org-fold-core--isearch-show
  isearch-open-invisible-temporary org-fold-core--isearch-show-temporary
  org-fold--spec-org-fold-outline-1035805047878762682 org-fold-outline

Am Sa., 6. Mai 2023 um 09:18 Uhr schrieb Michael Dauer <mick.dauer@gmail.com
>:

> Got another observation:
> Text content at position 30248:
>
>
> There is an overlay here:
>  From 30248 to 30442
>   evaporate            t
>   invisible            org-fold-outline
>   isearch-open-invisible delete-overlay
>   org-invisible        org-fold-outline
>   priority             5
>
>
> There are text properties here:
>   fontified            t
>   isearch-open-invisible org-fold-core--isearch-show
>   isearch-open-invisible-temporary org-fold-core--isearch-show-temporary
>
> Am Sa., 6. Mai 2023 um 08:24 Uhr schrieb Ihor Radchenko <
> yantar92@posteo.net>:
>
>> "Christopher M. Miles" <numbchild@gmail.com> writes:
>>
>> > I meet an unfold-able headline now. Then I record a video to show this
>> > unfold-able headline. I executed command "describe-text-properties".
>>
>> Please put the cursor right before the fold ("..."), execute M-x
>> describe-text-properties and share the properties description text.
>> You don't need video to share the property details buffer contents.
>>
>> --
>> Ihor Radchenko // yantar92,
>> Org mode contributor,
>> Learn more about Org mode at <https://orgmode.org/>.
>> Support Org development at <https://liberapay.com/org-mode>,
>> or support my work at <https://liberapay.com/yantar92>
>>
>