No taskbar workbench icon in Windows

What I expected to happen was...:
The Minecraft game client would have the Crafting Bench icon in the taskbar.

What actually happened was...:
The launcher gave "[Client thread/ERROR]: Couldn't set icon", and the icon defaulted to a generic icon. There seems to be some other errors in the log, may or may not be related.

Steps to Reproduce:
1. Open the launcher by double-clicking Minecraft.exe
2. Press "Play" once it's logged in
3. Wait for assets to be downloaded
4. Observe bug

Other
I have attached the full log, and a screenshot of the bug.