Affinity Designer 1.10.5 on Windows 10
Steps to reproduce:
Select an object in the drawing area by clicking once on it
Press the Shift key and click on another object in the layers list, just a few objects above or below the first selected object, in the same layer
Expected result:
All objects in the layers list between the first and last are selected.
Actual result:
Different objects are selected, from the first object, going in the other direction of the list, away from the last clicked list item.
Additionally, the last clicked list item has toggled visibility, which is entirely unrelated. (This seems to happen only if the last clicked item was clicked on the box in front of the object name, not when clicked on the object name itself.)