Lens correction for Nikon D5600 dt


I applied lens correction for some images yesterday and I found that nothing happend. Lookin into it the camera make i.e. D5600 was not found. The lens was discovered but not the camera make. In the drop-down it is gone but when I looked in the xml files in the lensfun dir there is an entry for D5600.
In May 2020 this worked but since then I upgraded to dt, I run Win 10 but I found the same problem on a Linux Mint installation.
Have I overlooked something?

I have two Lensfun folders. One original version and one named Version1. I think it is Version1 that darktable uses.