Chronomancer's 'Temporal Rift' skill does not properly reset ES values over 100% of max shield

Temporal Rift sometimes does not properly reset ES values to what they originally were, if they were over your normal ES cap. This might also occur with mana/health, but I can't personally prove/disprove that. I say sometimes, because the ES seems to be properly restored if your current ES and your previous ES are both above 100% of your normal cap. If your current ES is below, but your previous ES is above, you'll be restored to 100% ES, instead of the actual value you had 4s ago.

In the video below, I get hit from 5584/5020 to 3427/5020. I've watched frame-by-frame, and I was never at exactly 5020/5020. I then use Temporal Rift to return the ES I just lost, and I'm put up to 5020/5020. I then die to the second hit of the attack. In this case, I would likely have died regardless, but it's not hard to see that this bug can cause deaths that otherwise should not occur.
https://www.youtube.com/watch?v=t_nrtG_NWQo

I am comfortable in calling this a bug, because the Temporal Rift description just says '...Energy Shield values', and nothing about percentages, nor a cap to restore to.