Using the [1.21-mdg NeoForge MDK](https://github.com/neoforged/MDK/tree/1.21-mdg) as a minimal example, I get the following error when building gradle on a 2020 M1 Macbook Air.
```
FAILURE: Build …
Currently, parchment mappings cannot be used on MultiLoader-Template, as the Common project uses vanillagradle, which only supports mojang mappings. This means that when, for instance, navigating code…
runs fail if a mixin uses mixinextras feature (e.g. in my case `@Local`)
adding `io.github.llamalad7:mixinextras-neoforge` as runtime dependency fixes this