I purchased the game via Steam, and I login to factorio.com using Steam OAuth. So, my account does not have any password set. A blank password also doesn't successfully login.
Unfortunately I don't remember how I logged in successfully the first time ~3 years ago. If it helps, I used to launch the ...

When logging into the game using a username + token, the game fails to authenticate. When manually entering the token in player-data.json it works properly. I tried several times to enter the token, both using copy-paste as well as manually typing it. Problem persists in both cases.
OS: Linux ...

See the attached screen recording. This happens with no mods on a fresh save.
For consistency, undo should work with flipping as well since it is now a primary action that the player can do accidentally while walking around.