SDO_GEOMETRY FC — SE_ANNO_CAD_DATA field should be read-only in Fields pane

[Bud]

ArcGIS Pro 2.6.8; Oracle 18c 10.7.1 EGDB; SDO_GEOMETRY FC:

I've created an SDO_GEOMETRY FC using Catalog.

When I open the Fields pane, I notice that the default SE_ANNO_CAD_DATA field is modifiable (not greyed-out):

However, it seems like that field is not meant to be modified. I get error when I try to rename it or delete it.

Video:

I accidently cut off the the ribbon at the top of the screen in the video. The thing I'm clicking is the Save button.

Could that behavior be changed so that SE_ANNO_CAD_DATA is read-only in the Fields pane?