Open nested files "expands" the sequences

Weird.

14.9 build 38[R] with captions.

I have a sequence that I manually captionned.

I needed an intro and outro, so I nested it by going to the projects panel, dragging the sequence to build a new one. Then I worked on that, adding visual and graphics on top  of that.

Layers were : Ess Graphics Obj + Images, nested sequence and audio as one sequence.

Quit Premiere Pro, reopened the project and…

My "new sequence" was a mess :

APPEARING Captions, Ess Graphics Obj + Images,DISAPPEARED video sequence, ONLY audio sequence

I ruled out the naming issue by renaming the sequence (the copy had the same name in my first issue).

Am I the only one concerned ?

2min Video of the issue linked