Hello, Yanfly!
I think I found a bug. I thought it was only in my project, but when i tried on the sample project, I had the same thing.
For both ATB and CTB, when i switch the Turn Structure to 'true', my states with 'Auto-removal Timing: Turn End' never ends, and one of these states actually had Ex-Parameter MP Regeneration. And I never have any MP regenerated as well. So looks like the turn never came? I tried with the original Full Turn setting, and low/high numbers.
Oh, and when i switch Turn Structure to 'false', everything works normally, states disappearing, MP regenerating, etc.
To replicate what I did, simply change Turn Structure parameter to 'true' and add a state to an actor with 'Auto-removal Timing: Turn End' (i used 2 ~ 2 turns duration) with Ex-Parameter MP Regeneration (i used +10%). I used a spell to add this state to the actor.
Hope that helps! :)
- Riff