Design Studio defaults to Desktop Qt 5.x kit for MCU projects, which doesn't work

I have both Qt 5.15.5 and Qt 6.4.1 installed. When I create a new project using the Qt for MCUs->MCU preset, I immediately get this error, and QML items are not visible in the editor:

Switching to the Desktop 6.4.1 kit fixes it, maybe it should be the default?

Tested with: Qt Design Studio 4.0.0

Based on Qt 6.4.0 (MSVC 2019, x86_64)

Built on Mar 3 2023 04:34:17