Hey there HibiscusandRoses,
Thanks for keeping us updated on your results and for sharing these additional details with us. If restarting didn't help, we recommend that you try refreshing things by closing out the Messages app and testing again:
Close an app on your iPhone or iPod touch - Apple Support
1. From the Home Screen, swipe up from the bottom of the screen and pause in the middle of the screen.
2. Swipe right or left to find the app that you want to close.
3. Swipe up on the app's preview to close the app.
If that doesn't work, additional steps are limited since you're already fully updated and restarting didn't help. We would recommend that you reach out to Apple Support for additional help. They might have to investigate this further with you. Use this link to reach them: Get Support
Thanks of using Apple Support Communities. Best of luck.