Or you can hire someone (an independent developer) to look into the matter for you.
Informally speaking as a community member: Outside of paying someone to help you… Generally widespread issues are the ones most likely to get prioritized (for obvious reasons). Followed by issues that can be reproduced.
It’s unclear from your report whether what you’re experiencing is an obscure/edge case or not. I don’t have a Windows 11 instance handy to try to reproduce the same behavior on.
I was looking for a paid solution before. Nextcloud Enterprise as well as Owncloud unfortunately is beyond the financial means of a very small not-profit association.
I hoped someone might know another community with skilled members who might have an idea where to continue searching and testing.
Meanwhile there is more help in the other thread. I hope the best.