[6.9.2] Second sata ssd cache pool don't apply "discard=async" opinion

I can't find where to edit mount option

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emhttpd: shcmd (56): mkdir -p /mnt/big
emhttpd: shcmd (57): mount -t btrfs -o noatime,space_cache=v2 /dev/sdb1 /mnt/big
kernel: BTRFS info (device sdb1): using free space tree
kernel: BTRFS info (device sdb1): has skinny extents
kernel: BTRFS info (device sdb1): enabling ssd optimizations
emhttpd: shcmd (58): mkdir -p /mnt/cache
emhttpd: /mnt/cache uuid: df5fc6e5-4cb0-4d71-a45f-8ce5e95ecb3d
emhttpd: /mnt/cache TotDevices: 2
emhttpd: /mnt/cache NumDevices: 2
emhttpd: /mnt/cache NumFound: 2
emhttpd: /mnt/cache NumMissing: 0
emhttpd: /mnt/cache NumMisplaced: 0
emhttpd: /mnt/cache NumExtra: 0
emhttpd: /mnt/cache LuksState: 0
emhttpd: shcmd (59): mount -t btrfs -o noatime,space_cache=v2,discard=async -U df5fc6e5-4cb0-4d71-a45f-8ce5e95ecb3d /mnt/cache
kernel: BTRFS info (device nvme0n1p1): turning on async discard
kernel: BTRFS info (device nvme0n1p1): using free space tree
kernel: BTRFS info (device nvme0n1p1): has skinny extents
kernel: BTRFS info (device nvme0n1p1): enabling ssd optimizations