File Thumbnail for png/jpg

Hi, I am using the Steam version on Windows 10 and have an issue where normal files just don’t get given proper thumbnails in the file explorer:

Is there a setting I missed or some other mad science I have to perform to get proper thumbnails for PNG and JPG files?

For some other context:

Use(d) a slightly modified version of this regedit script to assign Aseprite as the Default for .ASE, .ASEPRITE, .PNG and .JPG. (Simply setting it to Aseprite.exe would always open a new window when opening a file by double clicking, instead of just a new tab.)

I am using Aseprite Thumbnails for Windows and deleted HKEY_CLASSES_ROOT\AsepriteFile\TypeOverlay.

Edit: Version is V1.3.15.4-x64