In this video I equipped two level 3 poison gems and aquired 100% poison resistance so I received 0 damage from poison. But my shield still breaks by poison.
Steps to Reproduce
1. Aquire more than 100% poison resistance with your gems.
2. Gain shield in a run.
3. Get poison damage from anywhere - The shield breaks.
A developer has marked this issue as fixed. This means that the issue has been addressed in the current development build and will likely be in the next update.