[MCL-17614] workDir switch does not work anymore

It seems that since version 887 of a Minecraft Launcher, the --workDir switch that is used to specify a custom working directory does not work anymore.

For example, on a fully updated Ubuntu 20.04, when downloading and installing the Minecraft package, then running:

minecraft-launcher --workDir=/home/asciiwolf/.minecrafttest

It crashes with:

[Info: 2021-04-15 19:47:33.745070895: Common.cpp(32)] Native Launcher Version: 921
[Info: 2021-04-15 19:47:33.745108725: Common.cpp(33)] Operating System: Linux
[Info: 2021-04-15 19:47:33.745119655: Common.cpp(34)] Application Data directory: //.../.minecraft
[Info: 2021-04-15 19:47:33.745130116: Common.cpp(35)] Executable Path: /.../minecraft-launcher
[Info: 2021-04-15 19:47:33.745139456: Common.cpp(36)] App Directory dir: //.../launcher
[Info: 2021-04-15 19:47:33.745152666: Common.cpp(37)] Game data directory: //.../.minecraft
[Info: 2021-04-15 19:47:33.745161876: Common.cpp(38)] Launcher dir: //.../launcher
[Info: 2021-04-15 19:47:33.745171056: Common.cpp(39)] Java dir: //.../jre-x64
[Info: 2021-04-15 19:47:33.745180256: Common.cpp(40)] TmpDir dir: //.../MinecraftLauncher.1000
[Info: 2021-04-15 19:47:33.745189396: Common.cpp(41)] x64: true
[Info: 2021-04-15 19:47:33.752443409: NetQueue.cpp(157)] NetQueue: Setting up.
[Info: 2021-04-15 19:47:33.752635912: mainLinux.cpp(250)] Running launcher bootstrap (version 921)
[Error: 2021-04-15 19:47:33.753070308: mainLinux.cpp(266)] Couldn't determine absolute path for 
[Fatal: 2021-04-15 19:47:34.002021619: mainLinux.cpp(508)] Launcher crashed while executing... signal: 5
[Info: 2021-04-15 19:47:34.002089820: mainLinux.cpp(511)] Freshly updated launcher crashed.

It used to work fine before version 887. I have tried it now on multiple distros and there was the same issue on all of them.

I am including a full log as an attachment.