It is somewhat difficult to reproduce, but I can do it reliably enough on Infernus. Just go into a Sandbox lobby, level everything up, and buy Escalating Exposure only.
Sometimes the Stack Count is displayed, sometimes it is not. I know however that it is still stacking up because at 20 stacks, Afterburn deals ~68 damage per tick on the dummy. The Escalating Exposure icon is still present, but the number of stacks is just missing. When there is only 1 stack on the target, the number 1 is still displayed, so that is not the case either.
You can sit in a lobby and change nothing, attacking the same dummy, and sometimes the stack number is shown, and sometimes it is not. I tried doing headshots vs. bodyshots, but the behavior is still non-deterministic. I do not know what causes it. I do not move my character, I change nothing, I just attack the same dummy every 30 seconds and sometimes it is shown and sometimes it is not.
Without Stacks:
With Stacks (only 1):
With Stacks (6):
Sometimes the Stack Count is displayed, sometimes it is not. I know however that it is still stacking up because at 20 stacks, Afterburn deals ~68 damage per tick on the dummy. The Escalating Exposure icon is still present, but the number of stacks is just missing. When there is only 1 stack on the target, the number 1 is still displayed, so that is not the case either.
You can sit in a lobby and change nothing, attacking the same dummy, and sometimes the stack number is shown, and sometimes it is not. I tried doing headshots vs. bodyshots, but the behavior is still non-deterministic. I do not know what causes it. I do not move my character, I change nothing, I just attack the same dummy every 30 seconds and sometimes it is shown and sometimes it is not.
Without Stacks:
With Stacks (only 1):
With Stacks (6):
