What could be called. It's not org-fold-core-style.

Can I be just a data corruption of the text properties? I've no idea what
they are exactly, and what other parts use them. Maybe a conflicting key,
or failed optimization, or side effect on the regions they apply to. I just
want to give ideas from somebody who is free of knowledge.

My guess is that the issue is within org-mode. But tell us, what functions
we should look for in our code and the used packages.

Am Di., 9. Mai 2023 um 08:23 Uhr schrieb Ihor Radchenko <yantar92@posteo.net
>:

> "Thomas S. Dye" <tsd@tsdye.online> writes:
>
> >> You can try
> >> M-x debug-on-variable-change <RET> org-fold-core-style <RET>
> >
> > In case it's helpful, I set debug-on-variable-change as you
> > suggested but was bitten by the bug without triggering the
> > debugger.
>
> Which likely means that something is calling folding functions from
> outline.el instead of Org-native folding.
>
> --
> 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>
>