CachyOS Cannot Boot with Multiple Monitors, Black Screen Stuck at Plymouth Interface Unable to Login

CachyOS cannot boot when using multiple monitors, showing a black screen waiting forever, stuck at the Plymouth interface with only a spinning icon, unable to login. After much troubleshooting, I pressed esc before the Plymouth interface appeared and found the system boot log:

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[FAILED] Failed to start Terminate Plymouth Boot screen.
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See 'systemctl status plymouth-guit.service'  for details.

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[*     ] A start job is running for Hold until boot process finishes up (1min 34s / no limit)

Plymouth is the program that displays the CachyOS boot logo, and it was the cause of the problem. This issue has existed in the community for a long time. Reference: [Tutorial] Disable or Remove Plymouth (boot splash)

Modify the systemd-boot configuration file:

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sudo nano /etc/sdboot-manage.conf

Find the LINUX_OPTIONS line:

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# Kernel options to be appended to the "options" line
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LINUX_OPTIONS="zswap.enabled=0 nowatchdog splash"

Replace:

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splash

With:

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plymouth.enable=0 disablehooks=plymouth

Update and apply the configuration:

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sudo sdboot-manage gen

Now the boot logo animation is disabled. Although something feels missing, the boot speed is faster, which is worth it.