I started having this problem since build 19587 (windows insider) and created a post on Feedback Hub 4 months ago. No comments or upvotes, though. Tried on Tweeter also. No response. I went back to 2004 and it is working fine for me.
So I created a VM to run insider builds in order to see if MS fix the problem but so far nothing. Now on build 20175. As these insider builds supposedly will become version 2010, it seems that the problem will persist and nobody at MS cares. I think our
best option for now, as already said in this thread, is to flood Feedback Hub with this problem and hope that somebody pays attention to it. If you search FH for SMB problems there's a lot of posts, old and new, but with very little comments or upvotes. I
found this one that I believe refers to 2004 and can be upvoted.
https://aka.ms/AA962wy
BTW in my case the share doesn't even appears in the network folder and when I try to access it I get this message
