It seems that the class(es) around ActorLayer do not get included for packaged builds. If using GetActors or MakeActorLayer nodes it will result in instant crash at runtime. You have to dig a little in the dump file to debug the error: I believe this can be quite misleading for people utilising the layers for let’s say, a BIM layer manager like I did.
Please could you consider including these classes during packaging or add warning during the packaging process. If you don’t want to add to packaged builds then an “Editor Only” note on nodes would be nice too.
For anyone that wants to use this layer metadata (Datasmith creates them), you can create a BP utility to copy the meta into a tag and use tags instead.