I’d like to get some more information about the workflow you are using. Can you tell me if you are using Topaz Photo AI as a standalone application or as a plugin for Lightroom Classic? If you are using it as a plugin for Lightroom, which of the following plugins are you using:
The RAW plugin, accessed through File > Plug-in Extras > Process with Topaz Photo
The External editor plugin, accessed through Photo > Edit in > Topaz Photo AI
And having looked at the *.tiff file created using something other than LrC, it seems that it might only be the preview image in the TIFF file that is affected.
So I am showing a screenshot rather than attaching the file>
To get a better understanding of the workflow you are using when you receive these edits, would you mind taking a screen recording of this behavior so I can see exactly what is happening? This will help the developers get the best understanding of how to address this issue.