Today we did boss 3 into boss 4 and the amount of desync/buggyness seemed way more than usual. We realised whenever we have fought boss 4 before that it would be the first thing we do and wondered if that was related.
So we left the raid instance, relogged and reformed party for a fresh start/instance on only boss 4. This cleared up all the issues it seemed. No more; invisible pools, invisible tank busters, boss stuck in walking animation.
A hunch I have is that boss 3 sky suns/cogs are messing with something and causing issues. It’s not uncommon for them to be stuck in the air for the instance that everyone can see.
It also seemed to be a bad day for orbus bugs in general the past 2 days so it could be something else but seeing as the problems eased sooo much from a fresh instance and relog, the evidence points towards a big issue on boss 3