Ok, last try until I give up
Did this warning start right then when you upgraded your panorama to 9.0.x? What about deleting the action in that profile (via cli on panorama), did you try this? The goal is to have a profile where maybe the http2 is shown in the web UI but not actually in the config that is applied to the firewall.
PS: I am with you that panorama should detect that as this warnkng is totally useless in this situation.
Give it a short try
Maybe then you get rid of this warning as the other possibility is probably waiting for a fix ... and this could take some time - or you live with the warning...
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