Flask enchant during Trialmaster fight, Bug report #4 187 642 629

After transitioning to Trialmaster arena flask enchant ("Used when charges reach full") stopped working. Flasks would gain charges throug "Gain 3 charges when you are hit by an enemy", reach full charges, but wont activate, unless pressed manually. After transitioning back to map flask enchant started working normally again.
Edit: happened during every fight on last character, not just a single case.