"No write since last change" error on netrw buffer

[user202729]

Steps to reproduce

1. Open vim
2. :e /tmp/ (see a netrw buffer. Other directories are fine)
3. Press s to change sort order. See the status bar below shows [No Name] [RO]
4. Press ZZ to exit.
5. See E37 No write since last change E162 No write since last change for buffer "/tmp/"

Expected behaviour

Exits cleanly.

Version of Vim

9.1.707

Environment

Linux

Logs and stack traces

No response