Hello, I have encountered with several different small/tiny icons:
-Eyedropper in toolbar
-Switch color (in all places)
-Change color to translucent (in all places)
MacOS 10.15.5 (19F101)
Affinity Photo 1.9.0
Note, as I understand, Eyedropper is fixed in beta, not sure how it is about the other icons. I am attaching screenshot.