Lightroom CC (Classic) Ver 7.0.1 (latest as of today) cannot recognize TIFF files saved from Topaz Studio on imports.
Opening the Studio written files in Photoshop works fine, and re-saving them from PS, overwriting the TIFF file with no changes otherwise, "reconstructs" the TIFF format such that Lightroom suddenly recognizes the file as well on an new import.
But the initial Topaz Studio file cannot be imported/viewed in Lightroom.
From the June update to Studio I see the below fixes for TIFF issues, but I could not find any earlier reports of Lightroom incompatibility. The PS fix apparently did not test for Lightroom.
TIFF files saved in TS cannot be opened or looks corrupted by PS
TIFF files saved from .NEF RAW file in TS cannot be opened in Nikon Software