SDE connections to geodatabase as schema owners not working properly

An enterprise GDB that was working fine seems to have gone wrong somewhere. When I connect to it as the system admin from ArcGIS Pro, I can see all the spatial data that is stored in the SQL Server database properly (vector layer as vector, raster layer as raster). However, when I connect to it as a schema owner (no matter which one), data cannot be seen properly. A bit convoluted to explain, but basically I would say that, when connected as a schema owner:

• Raster tables are seen as vector layers (a polygon with the extent of the raster).
• Vector layers seem to be recognized properly though (and displayed).
• I can’t load raster files to the GDB.
• If I right click on the connection as a schema owner I can see that "Geodatabase Connection Properties" is greyed out (when I connect as SA, it is NOT greyed out).

I highlight this thing about the "Geodatabase Connection Properties" because I have another Enterprise GDB that doesn’t have any problems, and when doing right click as a schema owner, "Geodatabase Connection Properties" is NOT greyed out.

User login name is the same as schema.

-> SQL Server 11.0.2100.60

-> SQL Server 2014 Management Studio

-> ArcGIS Pro 2.6.1