It is following the same rules as always. It just doesn’t seem that way because the cause and effect is unclear. Between the random attacks, triggered effects, deaths, summons, nonstop action, and overall increased speed, it’s nearly impossible for a person to follow an average Battlegrounds round in real time without animations.
It does seem pointless to apply this workaround to a final round though, when there’s not gonna be a shop phase.
Also, Blizzard has noticed the increased volume of reports since 16.6. Seems the detection logic is a bit oversensitive right now.
https://www.reddit.com/r/hearthstone/comments/fkx430/fix_coming_for_battlegrounds_animation_issues/