An active 1.12.2 window was already open without issues, but when I opened a 1.16 rc-1 window under a second account and installation at the same time, all settings and controls were reset. This includes key binds, video settings, sound settings, etc. Even my gamma was back to default, which I had edited by hand in the config file to a value of 1000.
The following day, I ran the game on the same account as I had the 1.16 rc-1 but on the previous 1.12.2 installation. While my gamma was back to the 1000 level, all in-game accessible settings and key binds were still default. Additionally, my flight speed for creative feels slower and when I am trying to place blocks there seems to be some extra delay between click and placement.
When previously playing with 1.16 snapshots or rc-1 as the only game instance, the gamma edit was never reset and stayed at the 1000 level, and my in-game settings and bindings were not affected.
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To Reproduce:
1) Change gamma value in Minecraft options file to anything besides the default.
2) Launch game in 1.12.2 using one installation
3) While 1.12.2 window is open, change installation and select a different MC account.
4) Launch game in 1.16 rc-1
5) Enter a single single player world in the 1.16 rc-1 window.
While you can see the default settings in the main menu of the 1.16 rc-1 window, the gamma reset is not evident until the player enters a world.
The two installations were independently created in the launcher. I chose a different one to switch between versions, but do not know where to find the folder containing different installation profiles in the .minecraft folder.
The launcher explicitly warns you when trying to start two instances of Minecraft in the same folder, because things like this might happen.
Then the launcher is incredibly flawed and needs to make it easier for players to properly create a new folder, rather than making it appear as if they have done so (when they select a different installation). I never understood why the warning existed for me because from my perspective I was selecting a different installation like the warning suggested.
Are the installations in separate folders?