With regards to CanCombineDroppedItem, my plugin is correct. The other plugins should not be returning false from this hook. The developers of those plugins should correct their code. If they are unsure they should check the Umod Rust API help pages. Hooks of type object should only return true or null. Hooks which return type Boolean can return true, false or null. CanCombineDroppedItem returns type Object, therefore my code is correct and that hook should never return false. You should report the issue with the other plugins developers. If they are still unsure they can also check that hook in the assembly.
With regards to CanEntityTakeDamage, i am not at home until Monday, so will look into it when I get back. I’ve come across this before I think but I can’t remember what caused it in the end so I’ll get back to you. In the meantime you could a ee if you can notice when the message happens, perhaps when people are mining heli debris?