When checking the latest.log to help me track down a datapack error, it seemed to stem from the following line:

[Worker-Main-21/ERROR] [LocalAnimationLoader/]: Mod: geckolib3 is using deprecated Pollen animations. Animations should be relocated to 'assets/geckolib3/pinwheel/animations'

Leading to

java.lang.NullPointerException: Expected to wait for resource modifiers, but serverReloader was null
at gg.moonflower.pollen.api.resource.modifier.ResourceModifierManager.getServerCompleteFuture(ResourceModifierManager.java:117) ~[pollen-forge-1.4.3+1.18.2.jar%23210!/:?]

This a pollen issue, we have not integration with them, all integration is on Pollons side.