The Emblem of the Golden Scarab doesn't nullify some potion effects, instead extending their duration indefinitely.
The easiest way to test this is to use a lingering potion of weakness, on survival mode, while equipped with the bauble. Then just use a regular sword - the mobs need way more hits to kill. Also the particle effects remain and it's not curable with milk. The only ways I found to stop it is to reapply a potion effect or die.

I tested this on mod version 1.12.2-0.2.6 with baubles version 1.12-1.5.2 (latest). This problem also extends to many other mods that apply potion effects in a similar fashion.

Tested on a fresh installation of Forge 14.23.5.2859 for 1.12.2 with only the Baubles and Unique Crops mods present. Attaching log files if needed.
debug.log
latest.log