I have a method decorated with the meta BlueprintThreadSafe and BluprintPure which i would like to use in the state transition node on the anim blueprint. However unreal still gives a warning that it is not thread-safe. i call it on a component of the character. The reference to this component is aquired in the event graph of the anim blueprint. Although the blueprint warning points to the method GetCoverComponent as non thread-safe, it doesn’t do so if i only read a value of a variable from the same component.
can confirm, it does not work for us either in 4.18.2. I think it stopped working sometime at the end of last year, so it can be the update to 4.18.2 from 4.17 for us. Not sure in which version between 4.17 and 4.18.2 it broke, though.
According to Class Specifiers | Unreal Engine Documentation the meta tag BlueprintThreadSafe can only be used with functions in a Blueprint Function Library class, UBlueprintFunctionLibrary.
Those functions needs to be static to work.