I landed here after a search for the same issue. I just got the Galaxy watch LTE this week and each time my watch disconnects from phone and switches to LTE, I get flooded with message notifications for every text I received since the last time my watch connected to LTE. Like others stated, I understand that this is because when paired with phone the message notification is from my default sms app on phone mirrored to watch from my primary number. When watch connects to LTE it's getting a native notification from tmo for the secondary digits line. What I wish was pretty simple, the watch should not receive native sms notifications sent during the time it was connected to the phone. Getting flooded with old messages each time the watch occasionally connects to LTE is rediculous. Pixel 2 XL with Android Pie and Google messages app.
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