It's not an official solution but I found a workaround for it. If you first sign up to the Jira app on Teams and then add the tab, with notifications set to the way you like it, you will not be getting those messages. This has to be so for every user that will be adding the tab separately though!
I know it's not perfect - again - it's a workaround that I just worked out.
Having this same issue currently - hoping somebody here has an answer
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