What you could do is:
- Create a new
dev
branch where the oldmaster
is. - Reset
master
to where the (old)published
branch is. - In the Environments menu, change the Default/published App Version to link to the (new)
master
branch. (Note: This step seems to require migrating your app to Environments, disabling related functionality in the Classic Editor.) - Delete the
published
branch to avoid confusion.
The only hitch I ran into when trying this is that the new editor is still hardwired to refer to master
as “the latest version” in the Environments dialog, contrary to my hypothesis above: