Can not correctly save a new notification channel for slack

I can’t save the new notification channel in slack correctly. I enter values in the fields: recipient and webhook url. The test without saving passes successfully. But after saving this channel, I see data in the token field that I did not enter, so the token field should be empty.
If I do the test again, I will get the error “alert validation error: token must be specified when using the Black chat API” but token already exist.
It seems to me that this is incorrect behavior. Application logs are empty about problem.
Version: standalone v8.3.0 (914fcedb72)

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