Describe the bug
When adding liquid to a tank that already has liquid by right-clicking, the total amount of liquid is not the amount of liquid in the tank + the amount added by right-clicking, but only the right-clicking amount, it ignores the amount of liquid originally in the tank.

Steps to Reproduce
Steps to reproduce the behavior:
Add a certain amount of liquid to any tank unit.
Right-click the tank unit to add some more liquid.
Observe that the amount of liquid in the tank is not the existing liquid plus the newly added liquid, but only the amount of liquid added by right-clicking.

Screenshots
If applicable, add screenshots to help explain your problem.

Environment (please complete the following information with the version):

• Minecraft: 1.21.8
• Mod Loader: Fabric