CCQ_Core

Liquid snowman cooler
Piping water and then coolant now correctly upgrades to freezing instead of staying on cooling. Higher-tier fluids can displace lower-tier fluid in the tank; if the tank tier is above the active fuel, the cooler switches immediately. Flowing variants were added to the regular and special coolant fluid tags.

Create: Fluid — fluid / smart fluid interface
Interfaces glued onto minecart (and similar) contraptions no longer silently vanish on disassemble when placement order briefly fails canSurvive. Breaks are deferred by one tick and only destroy-and-drop if still unsupported.

Create: Fluid — minecart assembly crash (Create 6.0.10)
Fluid 1.2.4 still read the removed Contraption.presentBlockEntities field, which kicked the client when assembling or loading a contraption with a gutter outlet or copper sink. Block entities are now resolved via the public API / reflection, and the copper-sink mixin apply failure was fixed.