[MC-82682] Usage of alternative game directory hangs on Mojang loading screen.

Please note this bug happens without any mods installed whatsoever.

What I expected to happen was...:
I changed the game directory through the launcher in order to have my saves in a different place( for a different set of mods, obviously ).

What actually happened was...:
The new folder was created just fine, but each and every time I try to run minecraft it hangs forever at the mojang loading screen.

Steps to Reproduce:
1. Change the game directory to something other than ".minecraft"
2. Run with that profile
3. Observe...

[18:16:50 INFO]: Minecraft Launcher 1.6.13 (through bootstrap 5) started on linux...
...
[18:17:04 INFO]: Half command: /usr/local/java/bin/java -Xmx2G -....:/home/greaperex/.minecraft/versions/1.8.7/1.8.7.jar net.minecraft.client.main.Main
[18:17:04 INFO]: Looking for orphaned versions to clean up...
[18:17:04 INFO]: Looking for old natives & assets to clean up...
[18:18:11 ERROR]: java.io.IOException: Stream closed
[18:18:11 ERROR]: java.io.IOException: Stream closed
...
[18:18:12 ERROR]: java.io.IOException: Stream closed
[18:18:12 ERROR]: java.io.IOException: Stream closed
[18:18:12 ERROR]: java.io.IOException: Stream closed
[18:18:12 ERROR]: java.io.IOException: Stream closed
[18:18:12 ERROR]: Game ended with bad state (exit code 137)
[18:18:12 INFO]: Ignoring visibility rule and showing launcher due to a game crash