Just a quick suggestion since I have some more insight on the situation. Maybe you can look at Velero, it should be able to migrate data. If not you can simply create a new fresh install, scale everything to zero, then create some debug pod mounting old and new pvc and copy data between the two. More complex to say it than do it.

Actually, it appears some elements (scalars, plots, etc) have no migrated by moving mongodb data.
Where are these stored? Any idea @<1523701827080556544:profile|JuicyFox94> ?

Scaling to zero, copying the mongodb data, and scaling back up worked like a charm.

Thanks @<1523701827080556544:profile|JuicyFox94> !