If you root your device by patching the boot.img with Magisk, the hash changes. If the vbmeta partition remains stock, it will detect this mismatch and refuse to boot, often resulting in a "Verification Error" or a device stuck in fastboot.
But note: the goal of "patch vbmeta in boot image better" is to avoid the above step. If you needed it, your bootloader is ignoring the in-image vbmeta patch (common on MediaTek devices).
In the world of Android rooting and custom development, the process of modifying devices has evolved significantly. In the early days of Magisk, the standard installation process involved patching the boot.img and flashing it, while often leaving the vbmeta partition untouched or flashing a disabled version separately. However, as Android security architecture has matured, the standard has shifted.
can handle dm-verity and verified boot internally by modifying values in the boot image to disable the checks that would otherwise cause a bootloop. Avoids "Data Corruption" Wipes : Manually flashing a vbmeta.img with flags like --disable-verity --disable-verification