You've probably been notified about this before but I'll make a post about it anyway.
After upgrading from EPi 5 to EPi 6 we receive an error whenever we try to compare page versions in admin mode.
Is this a known bug, and if so, how can we resolve it? Upgrading to EPi 6 R2 Beta seems shaky just because it's beta.
I know there is one of the compare modes which fails if you use Session state in the page template code.