MP 0.97 Moving Files not possible within "Favorites" tree

[foxy]

XnView MP Windows
Version 0.97.0 64bits (Sep 23 2020)

Effect: AFAIK in one of the previous versions it was possible to move files from the main thumbnails to a folder in the "Favorites" tree. This is now not possible anymore - the icon is just a "forbidden" sign.

To reproduce:
1. Open a folder with a least one picture
2. Open the favorites folder tree and expand it
3. Try to move a file from the thumbnails to a folder of the favorites tree
Actual behavior: "forbidden" sign

Expected behaviour: Moving of files possible as it is in the "Folders" tree.

[xnview]

this was never possible