This is just my opinion, obviously, and not an official view.
Kadokawa doesn't have to support any plugins besides the few official ones that come with the engine. Sure, they try to keep compatibility in mind, but the plugin ecosystem is not their responsibility.
This thread should be for questions directly pertaining to the 1.6.1 update and the basic engine. If there's truly an issue with a plugin (and the steps to upgrade were actually followed), then the plugin issue should be posted in the same place we always post it - either the plugin's own thread or in the "Plugin Support" forum.
Again, just my personal opinion, but I think you'll get the most help by following the normal procedure.