If your mod uses your own custom trunks and not vanilla ones, please remove the "conditionAffectsCapacity = true" lines from all your trunks' definitions. It will be transparent for your mod, because this property is anyway inherited by each trunk from "template vehicle trunk" specified in vanilla "template_trunk.txt", so your mod will still be working fine.

My mod overrides that vanilla file setting "conditionAffectsCapacity = false". But if a custom trunk explicitly specifies it differently, it has no effect.

Thank you!