Form fields cannot have names that are present as attributes on the form
|Reported by:||Owned by:||nobody|
|Has patch:||yes||Needs documentation:||no|
|Needs tests:||no||Patch needs improvement:||no|
This was broken in #8620. Fixing this is impossible, unless shadowing is only enabled for None, at which point the fix becomes trivial ( https://github.com/gcbirzan/django/commit/f62f991444610ebadad809981d9a037298a660db ).