Bosses spells/events happening when they should notbe able to

Tonight my guild put in awesome attempts Hodir 25 Hard mode. we had him at 5% cache was up, he started hard-casting Flash Freeze. we got him to 0% before he finished casting. He then decided to smash his cache before going friendly.

Insult to injury WCL counts it has HM. https://classic.warcraftlogs.com/reports/W93bzkJYLC16A7xa#fight=60

I’ve noticed this is in more raid boss behavior recently where bosses will queue up abilities and then fire them out even if they most certainly should not. Numerous times on 10 and 25 I’ve seen yogg summon phase 2 tentacles after groups have gotten his brain to 30%, even with plenty of time to spare.
An example of that is here: https://classic.warcraftlogs.com/reports/La24nTM6ZJBW1rRb#fight=54&view=replay

Has anyone else noticed this behavior in the last few weeks?