I have installed Version 2.3.0. Since this version, RAWs from the Lumix G9II (RW2 files) are compatible with Topaz Photo AI.
I opened the RAW files from Lightroom via additional Modules and wanted to save it after editing as .dng file to Lightroom.
Addition:
When I import dicectly into Topaz Photo AI the following applies:
When I go to Edit - Preferences and there Export and switch use Adobr DNG SDK for exort OFF, the dsaving as .dng file works. If I switch it on, the reaction is as described and shown in the pictures above.
When I am in Lightroom and open the RAW file via extra modules, I can save in Topaz, but Lightroom does not import the picture with the following notice: