Startup error in WSL since upgrade

I recently opened my Ubuntu app, installed with WSL1 and was greeted with a friendly message to upgrade WSL with the command wsl.exe --update. I did so, restarted my computer, but am now greeted with a less friendly message every time I start the Ubuntu app:

<3>WSL (2084) ERROR: CreateProcessEntryCommon:570: execvpe /bin/zsh failed 2<3>WSL (2084) ERROR: CreateProcessEntryCommon:579: Create process not expected to return

As far as I can tell, no functionality is impacted (except emacs now opens emacs in GUI mode for some reason).

But these messages annoy me. Any idea why this is happening?

Versions of things:

WSL version: 1.0.3.0Kernel version: 5.15.79.1WSLg version: 1.0.47MSRDC version: 1.2.3575Direct3D version: 1.606.4DXCore version: 10.0.25131.1002-220531-1700.rs-onecore-base2-hypWindows version: 10.0.19045.2486