it was this:
there is a function in UE4 called ‘UAITask_MoveTo::AIMoveTo’, and it’s has a meta ‘BlueprintInternalUseOnly = TRUE’, which should means i cann’t see and call this function in Blueprint.
but in fact, i do can see and call it in Blueprint!
i had tested the meta ‘BlueprintInternalUseOnly = TRUE’ in my class, without doubt Blueprint cann’t see the function used this meta;
furthermore, i’ve searched all the engine code, and cann’t find any call about the function ‘UAITask_MoveTo::AIMoveTo’?
any help would be very appreciated!