Hello NicRocPer,
Welcome to the Apple Support Communities!
I understand that after the latest iOS update you noticed Messages not behaving expected. In this situation, there are a few troubleshooting steps that I would recommend.
First, I would recommend completely closing the Messages application as described in the attached article.
Force an app to close in iOS - Apple Support
After Messages is closed, please sign out of iMessages completely by following the instructions in the next attached article.
If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support
- Go to Settings > Messages > Send & Receive, tap your Apple ID, then tap Sign Out.
- Go to Settings > FaceTime, tap your Apple ID, then tap Sign Out.
- On your iPhone first, sign back in to iMessage and Facetime.
- Sign back in to iMessage and Facetime on your other devices.
After you have signed out, please reset your iPhone and then sign back into iMessages to test the situation. If the issue continues please let me know.
Restart or reset your iPhone, iPad, or iPod touch - Apple Support
Have a great day,
Joe