After the last update 5.0.142 in the event panel when I choose an existing variable it just doesn’t appear. In the image I can click “Variable1” or “Variable2” and nothing happens.
Also on Linux Mint, using the flathub version, can confirm the above for 5.0.142.
Can’t put anything in the value field either, not from the expression builder or typing direct. Tested for changing value or string of a variable, modifying text and tinting a sprite.