Ah, that could be. Location Target Type came in pretty late.
C++ variables should be fine. Blueprint variables are a different cat. The class gets re-instantiated after recompile, so it’s possible it could lose properties. I would definitely suggest C++ tasks over Custom Tasks if possible, or use a “Measure twice, cut once” approach to custom tasks (use one Ability to hammer out all the required changes to your custom task - then use it in other Abilities, so you aren’t constantly recompiling the task).