SaltPowered

I have this same issue, where the game isn't starting the modded client and is running as if it's vanilla even though it's clearly selected in the launch options stated above. This is only version 1.12.2 that isn't working though, as when I change it to 1.15.2 it launches just fine and has the logo saying it's being supported by Forge. I need to use 1.12.2 to run Pixelmon, so I would love some help on this matter. The logs don't state anything about forge not running, just that movement keys were skipped for some odd reason.