At some point in the past, Crystal Fragments was changed to not proc out of combat. Today I realized that when stuck in combat in PvP (flashing red screen borders, unable to mount or port for minutes etc) I'm not able to get a Crystal Fragments proc. Maybe it's similar with the various Ultimate regeneration passives that only work in combat.
Hopefully this information helps to fix the very annoying stuck in combat bug.
no CP PvP PC/EU
EP Zergborn
DC Zerg Beacon
guild master, raid leader, janitor, and only member of Zergbored