Which Lensfun version is used to provide lens corrections? My lens is supported by Lensfun 0.3.3 (the latest version), but not Lensfun 0.3.2 and earlier.
Topaz Photo AI does not seem to be using 0.3.3, as I don’t get lens corrections for my images. Can we expect that the Lensfun support will be updated soon?
The latest release of TPAI had a Lensfun update, so I don’t imagine they are behind on updates. So if your not getting lens corrections, there might be other reasons for it.
I would raise a ticket to check that your lens is supported, and work from there.