Why is ubifs lost after restarting

ubiformat /dev/mtd11
ubiattach -p /dev/mtd11
ubimkvol /dev/ubi1 -N data -s 90MiB
mount -t ubifs ubi1:data /mnt

Convert /dev/mtd11 to ubifs partition through the above command, it can be used normally after hanging, but after restarting the router /dev/ubi0_1: UUID="######" TYPE="ubifs" is lost, What is the reason for this, is it the lack of a save operation, or is the ubifs partition itself lost after restarting?