When the Enchantment Applicator's tank is more than half full, the gauge and tooltip behave as though it were empty. This seems to be a visual bug as The One Probe shows the correct amount and the fluid is still extractable.

Industrial Foregoing Version:
industrial-foregoing-1.16.5-3.2.14.7-16.jar

Titanium Version:
titanium-1.16.5-3.2.8.7-22.jar