When adding selected images from a contact sheet to a collection using cmd+b, the selected count (Selected x of y... – in the bottom left of the app window) sometimes updates to something else not reflecting the actual selection in the contact sheet shown.
It is not all contact sheets which shows this oddity, like collection contact sheets apparently doesn't. I've reproduced with contact sheets from quick search and regular folder contact sheets from the Navigator.
Also, as shown in the screenshots, the Browse tab in the Organiser lights up, indicating two selected tabs...
Steps to reproduce:
1: In the Collections pane, select a collection (Col1).
2: Open Quick Search and perform a search resulting in more than 32 images. select some images.
3: Select one or a few images in Sheet1, , make a note of the Selected x of y count, then press cmd+b to add them to the Col1 collection
4: Look at the Selected X of Y have changed updated to something else.
/Michael