Seen the same issue on a stream by Q8Pilot flying in to KLAS.
As I am not having that happen with the Zibo 738, I think it has something to do with the LeveUp.
Just a heads-up on the installation instructions:
It states to create the liveries folder in X-Plane 11/Aircraft/Laminar Research/737NG Series, named 'liveries'.*
But you should NOT put the base pack 737NG Series in the Laminar Research folder, but directly in the Aircraft folder, like X-Plane 11/Aircraft/737NG Series or a personal folder like: X-Plane 11/Aircraft/LevelUp/737NG Series. Then create the "Liveries" folder in 737NG Series.
This might become a Christmas gift, and knowing that I have a short vacation in December, I already know what I will be doing.
Looking forward to the release.