The included toolchain esp-2021r2 contains a "bug" (missing dll's) that cause it not to run (properly) on windows.
Especially the GDB server of the RISCV architecture will exit without an error message.
Causing the PlatformIO debugger to not start without any error message.

Espressif has fixed this. https://github.com/espressif/crosstool-NG/releases/
Please update the toolchain to: esp-2021r2-patch2