Hi Davision,
I attempted to reproduce this but I wasn’t able to get your results. I’m glad creating a new timeline fixes the issue for you, but if you find a reliable way to reproduce the issue then we can investigate further.
I think it’s just an anomaly where a timeline was copied and then there was a code change in a later build that didn’t agree. I say anomaly because it doesn’t seem to be easily reproduce and I would imagine we would have gotten reports about projects breaking from across the board when 4.13 released.
But in the meantime I’ll keep an eye out for any other reports of this.
Thanks,
TJ