Hello IcedCoffee_Corgi_Queen,
You have already done some solid troubleshooting.
Keep in mind that notifications will go to your iPhone or your Apple Watch, but not both. Information on how this works can be found here: Notifications on your Apple Watch - Apple Support
If the notifications are not working as they should, be sure watchOS is up to date. On the watch, tap on Settings > General > About. The current watchOS should be watchOS8.6. If needed, here is how to update: Update your Apple Watch - Apple Support
When the Apple Watch was paired back to the Apple Watch, was a backup restored? The reason we ask is that if whatever is causing the issue to occur was in that backup, restoring the backup may also restore the problem. You may want to unpair the Apple Watch, and then pair it back as a new Apple Watch. You can see how to set up as new here: Set up your Apple Watch - Apple Support. Be sure to set up as new when provided the choice.
Do you notice the issue happening after performing a particular action?
Trying to isolate the issue can help when trying to find a solution.
Have a good day.