OnePlus 6, MS Launcher beta. Attached video contains all required steps to reproduce issue.
- Download some icon packs from play.market. It is not necessary, but I checked for sure
- Start changing icon for a object like shortcut or folder
- You can search for an icon in pack, do it
- Select icon found in that way and click it
- Window allowing you to select an icon from pack is closed and nothing is changed
- I hope it is visual bug, but clicking apply and even launcher restart won't change the icon
- The only way to specify it is to find it in hundred other icons
Besides functionally the bug is not greater than normally actually it makes customizing icons unacceptable.