Play Montage / Montage Play Glitches/Bugs?

Anyone else running into bugs on these nodes? I am randomly having issues where they fail to play and return 0 for the length of a montage that was working just a minute before. I can seem to fix it (at least temporarily) by deleting and creating a new node or replacing variable montages with hard coded ones - but its got me very confused as I can’t figure out why this is happening. I so far find no logical connection to the nodes failing and any changes I am making to the rest of the code…