Chris_C1455 & shochdoerfer - There seems to be a bug where roomlists with workspaces in dont show up in the buildings. Typing a room list name directly into the building filter seems to still work though.
I raised a Microsoft Support ticket and this is what the Exchange Online Engineer closed my ticket yesterday with:
Thanks for replying, I completely agreed with you regarding metadata refersh where in it takes up to 3 days, in my lab takes more than that and for this metadata refresh issue already highlighted to backend team.
I understand that not possible to use legacy version of room finder in your case and for new room finder we know there is a bug in it.
Hence in this case you just need to wait and once this bug will get fixed then only it the behavior of new room finder will be normal. Until the bug is not get fixed we can see very weird behavior of new room finder. Hence our back end team suggested to you use legacy version of room finder but unfortunaltey in your environment you can't use legacy version.
I hope you understand that no troubleshooting required on this case and already issue highlighted to PG team where in PG team already raised a BUG and working on it.
As you can see, there is a known bug but no time frame given on when a fix is occurring (and the engineer acknowledged a long metadata refresh time which was passed to the backend team).
The_Exchange_Team - This solution has been around publicly since mid 2020 and we still seem to have major issues using it. Please sort it out and make known bugs (especially feature breaking ones) visible somewhere with etas on the fixes so we can make business decisions around them.