recovery mode doesn't work

I'm trying to access the recovery mode in my PC with the adb reboot recovery command but my smartphone shows the "No command" message and icon on the screen and after I while, it just restart normally.

I just wanted to install Magisk so I did.

C:\adb>adb reboot-bootloader

C:\adb>fastboot flash recovery recovery.img
target reported max download size of 536870912 bytes
sending 'recovery' (21104 KB)...
OKAY [ 0.491s]
writing 'recovery'...
OKAY [ 0.235s]
finished. total time: 0.736s...

recovery mode doesn't work

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