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I made a post about this issue on the answer hub, here: Custom behavior tree services & tasks not working after editor restart - AI - Epic Developer Community Forums
It has several confirmations but no answers, and this post is the only other reference to the issue I can find. I’m hoping a little bump can give it some visibility, thanks!
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I found out what the problem was and how to fix it a few weeks ago. The problem is created when trying to access other objects and object variables in your Task or other behavior tree type blueprint. All you need to do to fix that is simply add those objects to your blackboard and access them through the blackboard rather than trying to do it directly.