For anyone waiting for solution like me, this is official reply from support:
Unfortunately, we do not have an ETA on this, but the developers are working on it.
In the meantime, the workaround, like copying the block out of the pattern editor, editing it on a page, then pasting it back, is currently the best temporary solution.
We’ll keep you updated as soon as we have more information or a patch available.
Make up your own mind, but this bug has been known for almost 4 months now. For example, HPOS was introduced in 2023, and ACF added support in 2025. So I guess we can expect a fix in about two years…
