In order to keep together all data that belongs together (which fosters solution of the issue for everyone affected), I suggested to consolidate experiences and what people have in common in this topic here → you might use this one IF its elaborations apply to you. Feel free to add more information to help identifying what all have in common in order to identify what cases are the same, and what might be the origin.
I leave all other topics open as the elaborations of the three topics (this one, No.2 plus No.3, and maybe more) do not yet make clear if that really are all the same issue. So if you think the one I mentioned does not apply to you but any of the other, you may of course keep posting there. But I suggest to mention your reasons in order to help delimiting the issues.
Everybody is free to open a bug report of course, but I suggest to invest the time to fill its fields carefully and produce and provide relevant data/logs that get attached, in order to get a real chance that a maintainer can pick it up (especially in times of a new release maintainers have to focus).
If you see more related topics that might resemble one of the existing ones, feel free to let them know about the others.
When I had a moment to spare, I could verify that the long freeze that occurs before the system goes sleep (as elaborated earlier, when sleep is started by closing lid, it takes 10-20 seconds until it actually goes sleep; frozen till then) is itself just the side effect of the non-responsive WiFi that hangs for the mentioned time: if WiFi is disabled, sleep works. All other symptoms remain as mentioned, at least in my case.