Ota updating is not recommended as it may invite any new issues, something may get messed up, and also sir @StaryMuz explained
So, it is better to follow this.It's a bit different with OTA updates. So far, developers have not managed to fully enable A/B slot switching in recovery and therefore OTA updates often don't work as they should. It's all new in Android 11.
So for now it is not reliable and a dirty flash using the ready-made Fastboot OTA Tool is more reliable.