simple zfs raid 1 replace failed disk

Hello,
i'm try to replace an hdd failed.

i have simple proxmox VE with 2 SSD disk 512GB
1 is dead.

i try to replace with 1 hdd SATA 750gb, because is on my lab is not a problem.

i detach ssd broken, attach hdd and on ssh:
zpool replace rpool 9569750636164580599 /dev/sdb

now with
zpool status -v rpool
state: ONLINE

so seems ok, but if i run
fdisk -l

Disk /dev/sda: 476.94 GiB, 512110190592 bytes, 1000215216 sectors
...
Device Start End Sectors Size Type
/dev/sda1...

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