Yet no workaround as far as I know. Our website has over 47k tags, so my guess would be that the huge number of tags can be a reason. I will try to contact the support.
Yes, same here. It happened after the update to the latest WordPress (5.9). Although I have downloaded the updated version (tested up to v. 5.9) from GitHub, the problem with tag’s freezing the page remains.
Yes, I already sent an email regarding this to them. There is a problem with jquery sortable UI. It might be incompatible with the jquery version that comes with the new version of WP.