Hello everyone!
I had this thread brought to my attention, and I have great news! This is indeed a bug and was fixed as part of 5.6. It did not make it into a 5.5 hotfix as it had a header change for the function. You can find the relevant changes made on our GitHub. Here is a direct link to the commit for those interested: StateTree: Fixed crash during bindings compilation (accessing view to array under modification).
Thank you for bringing these issues to our attention. I hope this can help unblock you and any other users on 5.5.
-James