Forge 1.14.2 Server failing to launch "gameDir is not a recoginzed option"

[Krzd]

Startup Log:
 

D:\Servers\Minecraft\Servers\New\1_14_2-Forge>java -Xmx1024M -Xms1024M -jar forge-1.14.2-26.0.5.jar nogui
2019-06-08 12:28:17,308 main WARN Disabling terminal, you're running in an unsupported environment.
[12:28:17.418] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher running: args [--gameDir, ., --launchTarget, fmlserver, --fml.forgeVersion, 26.0.5, --fml.mcpVersion, 20190603.175704, --fml.mcVersion, 1.14.2, --fml.for
geGroup, net.minecraftforge, nogui]
[12:28:17.422] [main/INFO] [cp.mo.mo.Launcher/MODLAUNCHER]: ModLauncher starting: java version 1.8.0_211
[12:28:17.658] [main/INFO] [ne.mi.fm.lo.FixSSL/CORE]: Added Lets Encrypt root certificates as additional trust
[12:28:18.089] [main/INFO] [cp.mo.mo.LaunchServiceHandler/MODLAUNCHER]: Launching target 'fmlserver' with arguments [--gameDir, ., nogui]
[12:28:18.759] [main/FATAL] [minecraft/MinecraftServer]: Failed to start the minecraft server
joptsimple.UnrecognizedOptionException: gameDir is not a recognized option

Additional infos:
No mods installed,

vanilla server launches without issues,

same error(s) with "java -jar forge-1.14.2-26.0.5.jar nogui",

does also not attempt to launch a GUI without the "nogui" argument
OS: Win 8.1
 

 

Would be very helpful to find out what causes this and how to fix/circumvent this, thank you!

Edited June 8, 2019 by Krzd

[AlexHgC]

Same with all versions, forge 26 are in beta state, maybe don't work for server actually, waiting for official reply