Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
There is a bug in the CubeMX project generation; the workaround is simple: you should refresh the project after the first successfull compile (select the project then hit F5 or right-click >> Refresh) and then it should work.