Screenshot :
Depth Mask on :

Steps :

0 : enable Depth Mask into Universal Tweaks
1 : add an item in your inventory
2 : make a /kill
3 : go to the tombstone location
4 : watch liquid become invisible when Depth mask is activated

Mods list :

!configanytime-1.0
!mixinbooter-8.3
tombstone-4.6.2-1.12.2
UniversalTweaks-1.12.2-1.7.1

Same as #453, the depth mask bugfix fixes vanilla issues but causes other issues with mods which already built around the flawed vanilla behavior.