Hi, breeze support two places icon sizes for folders small with standard 16px and large with 64px standard. The small folders were used at 16px, 22px and 32px (there is an discussion). The folder preview work for ALL sizes. It doesn't make that much sense for 16px but it work. when you choose 22px and say preview you see the large icon with the preview. Is it possible to use the icon in the selected size for the preview mode. Reproducible: Always
Created attachment 93871 [details] preview mode in 22px folder icon size
As previews in small icons doesn`t make that much sense maybe you can have folder view only up to 32px
This is still an issue in Dolphin git master. At 22pixels the previews for inside folders are basically useless. For 22px and below no previews should be provided.
*** This bug has been marked as a duplicate of bug 387154 ***