From #61847 (comment):

But the most intriguing for me was:

enum E { a } void f(E e) { f(E.b); f(.b); }

[T]he dot-shorthand property access has all:

• Change to 'a'
• Add enum constant
• Create getter
• Create field

But the E.b access only has the first two.

My guess is that the fixes are not in the list for the diagnostic in question.