plymouth-quit-wait.service hangs at boot with specific systemd service

[Simone Pilia]

Hi to all
I'm a contributor of suse-prime project, that allowing users to switch
graphics in Nvidia Optimus laptops (https://github.com/openSUSE/SUSEPrime/).
There's a service (prime-boot-selector.service) that select preferred card
during boot. When this service runs with plymouth enabled, it stucks
(plymouth) at boot with infinite "A start job is running for Hold until
boot process" and plymouth debug says
"plugins/splash/details/plugin.c:320:on_boot_output    : writing '   ".
prime-boot-selector.service never starts and system remains in this status.
Is it our script issue?
Thanks
Simone
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