Category badges not updated on first view of folder

[bgoodman]

Using XnView MP 0.79 x64 on both Windows 7 and Linux Mint 17.3.

In browser, select a folder which has image files and XMP sidecars with categories specified.

The images are displayed but no category badge is added to the thumbnail.

Switch to another folder and return to the first folder and the badges are displayed.

[xnview]

strange, and if you have only 1 file (and sidecar) in a folder?