When using McDoom with the Void Totem mod the Void Totem functionality doesn't work anymore. Upon closer inspection, it appears that the issue is likely rooted in the code of McDoom, specifically in the LivingEntityMixin file. As the void totem highly relies on the isBypassInvul check and your mod totally overrides this, the void totem doesn't work with McDoom installed.
This issue seems to persist across multiple versions of McDoom, including 1.19.2 and 1.19.3.