I have most of my org files marked read-only in beorg (via the init script). This inhibits the normal editing functions, as desired. But when I push the left of the two upper-right-corner icons (I don't know the name, sorry), as circled on the attached screen shot, I find that beorg will indeed make changes to the file. Are you able to reproduce this?
Yes, I got that too with the full page editor.
And as the file is considered read-only, you can't even revert to a previous version.
Thanks for reporting this, I'll get this fixed in the next release.