Composer modules not working

[Limmek]

When specifying more than one dependency under COMPOSER MODULES it stops working.
I am using slimphp as example here.
With only slim/slim it will download on server start as expected.
When adding more dependencies slim/slim slim/psr7 will result in error on start ash: slim/psr7: unknown operand.

[Pterodactyl Daemon]: Checking server disk space usage, this could take a few seconds...
[Pterodactyl Daemon]: Updating process configuration files...
[Pterodactyl Daemon]: Ensuring file permissions are set correctly, this could take a few seconds...
container@pterodactyl~ Server marked as starting...
[Pterodactyl Daemon]: Pulling Docker container image, this could take a few minutes to complete...
Pulling from sigma-production/nginx-ptero
Digest: sha256:5c959f9b32ce5d958528fb2fb1029bc26de42f8229955c8c1d0e61966b71d344
Status: Image is up to date for ghcr.io/sigma-production/nginx-ptero:8.1
[Pterodactyl Daemon]: Finished pulling Docker container image
ash: slim/psr7: unknown operand
:/home/container$ ./start.sh
container@pterodactyl~ Server marked as running...
⟳ Starting PHP-FPM...
⟳ Starting Nginx...
✓ Successfully started