There is something broken, all in all. Create an empty patch, create any module node, don't do anything and just
Save all, using either leaf menu or
Ctrl Alt S and you'll be prompted with
The file cannot be saved as it is marked as readonly!
Use Save as.. instead.
edit: referred to the module.
And this happens in alpha, but also 35.8. With all due respect, this is not a desirable behavior.