Actor Reference: Cannot pick actor in level

In 4.13, I could add an actor reference array variable to a blueprint and then drag that blueprint in a level and use the picker/list to add actors to its array.

In 4.21, it doesn’t work anymore. The picker/list will only allow me to select other blueprints in the level, not any actor.

Would anyone have an idea of why this is happening? I’ve tried back and forth on both versions so I am sure I’m doing the steps right. Thanks!

4.21.1 exactly is what I’m using*