Jeffery1000,
We appreciate the follow-up. To further narrow this down, is it only happening with photos that were part of text message threads on the originating Android?
Have you tried the steps below to see if you can manually migrate content? Move content manually from your Android device to your iPhone, iPad, or iPod touch - Apple Support
"Photos and videos
You can use iCloud Photos to keep your photos and videos in iCloud, so you can access your library from any device, anytime you want.
To move photos and videos from your Android device to your iPhone, iPad, or iPod touch using a computer:
- Connect your Android to your computer and find your photos and videos. On most devices, you can find these files in DCIM > Camera. On a Mac, install Android File Transfer, open it, then go to DCIM > Camera.
- Choose the photos and videos that you want to move and drag them to a folder on your computer.
- Disconnect your Android and connect your iPhone, iPad, or iPod touch to your computer.
- On a Mac with macOS Catalina, open Finder. On a Mac with macOS Mojave or earlier, or on a PC, open iTunes. On your computer, sync your photos to your iPhone, iPad, or iPod touch. You can find your photos and videos on your device in Photos > Albums."
Let us know how it goes. Take care.