In encrypted rootfs, I edited /etc/crypttab to the wrong UUID. Is it a correct move that does not affect the boot?

I wanted to verify that the rootfs encryption was done correctly, so I edited /etc/crypttab in the initrd and intentionally changed the UUID value to the wrong value.
I then rebooted and there were no errors at boot time and the rootfs mounted correctly.
I expected the error to occur after the reboot.

I encrypted the rootfs in the eMMC.
Is there any such thing as not using the /etc/crypttab setting in eMMC rootfs encryption?

The system boots to rootfs in APP partition so it can boot with or without APP_ENC partition. The data is APP_ENC shall be protected with password.

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