Freeze buildup consumed, but not freezing

Bug Report ID: #3992728804

Just tested this a bit as i encountered enemies i could not freeze.

Setup:

Involved Gems
Freezing Shards with Arcane Tempo and Frost Nexus

unique items
Taryn's Shiver Gelid Staff
Icetomb Mail Vestments


Problem
Enemy that receives the last bit of freeze buildup consumes the buildup but does not get frozen and is freeze immune afterwards. To clarify, this only applies to a small, but notable amount of enemies.

While i found another bug report with a similar problem and also involving Icetomb,
there was at least one case in which the last bit of buildup was definetly not caused by Icetomb, but my Freezing Shards, causing Kabala to be immune to any more freeze buildup. She was in her summoning animation and my energy shield kept recharging, so i'm quite sure she did not hit me, which is the activation condition for Icetomb (unless i somehow received a "hit" from her in her animation AND evaded it with only 99 evasion which is 0% estimated chance to evade, which would count as a hit afaik, also i have no block chance).

That being said, a lot of the freeze immune enemies were actually caused by Icetomb without me noticing in that moment.


Update:
After another 20 minutes of testing this on Kabala, this time without Icetomb equipped, i seem to be unable to reproduce the bug.