Well, you lot at opera have done it again.
I had previously posted about the Flash Player popup message (let us turn off that flash announcement popup) which finally sorted itself out when Opera updated to 74.0.3911.75.
But now, tabs are being snoozed regardless of whether the option is turned on or off in settings. So well done, you have replaced an annoying problem with a bloody annoying problem.
Sort your act out.
By the way there is another post mentioning this and they are running Opera 75.0.3939.0 developer update, so this problem must have been around for some time.