I am using ArcGIS Pro 3.2
Last week, I set all the fields in one feature class in a map as Read Only in preparation for sharing it to the portal where I don't want any to edit the data. Today, when I went to work on the map, I saw a data error that I wanted to correct. I made sure editing was turned on and clicked on the cell to edit. Nothing happened. I couldn't edit the cell directly. Then I tried Calculate Field. When the tool opened, the target field was not the one I was trying to edit. I changed it to the field I wanted to edit, and proceeded to make and save the edit. When I tried to edit another field, the same thing happened. Not trusting this weirdly behaving layer, I started to investigate. Then I remembered that I had set all fields to Read Only.
I came across this behavior by accident, but now I am concerned. I thought that Read Only protected a field from being edited (except if one manually went into Data Design and turned off Read Only). Is Calculate Field supposed to be able to edit Read Only fields?