BigQuery error log message interacts with Log Explorer alert but shows nothing ?

[HackTD]

I have this policy which will send me an email every time there is a error appears on the Log Explorer and while I was writing some BigQuery codes to query the alert triggers when BigQuery show error message. I went to check on the Log Explorer and there was nothing. Is this even possible ? How can exclude BigQuery from my log's alert

- Here is my policy condition:

- No error logs since June but alerts send me this email