USB device dropped by OpenWrt (WRT1900ACS, USB device disappears after a while)

Installing and Using OpenWrt
5

I mounted USB as /opt (not the original /mnt/sda1) by manually changing fstab. fstab now looks like this:

config global
	option anon_swap '0'
	option auto_swap '1'
	option auto_mount '1'
	option delay_root '5'
	option check_fs '0'
	option anon_mount '1'

config mount
	option target '/opt'
	option uuid '____________________'
	option enabled '1'

I set up AGH as suggested by mercygroundabyss here: [How-To-Updated 2021] Installing AdGuardHome on OpenWrt [Manual and opkg method], using the install script to install AGH to /opt.

block detect on the other hand now looks different from fstab:

config 'global'
        option  anon_swap       '0'
        option  anon_mount      '0'
        option  auto_swap       '1'
        option  auto_mount      '1'
        option  delay_root      '5'
        option  check_fs        '0'

config 'mount'
        option  target  '/mnt/sda1'
        option  uuid    '_____________________'
        option  enabled '0'

Probably this is where the possible reason lies. I am afraid I do not understand how come fstab and results from block detect are different and how they became different, and how to make so that fstab settings are not overridden in the future.