I’m well aware. It’s also a one line change to the myst parser to make that work. In any case, it’s because a myst code block with curly brackets is really a s

I’m well aware. It’s also a one line change to the myst parser to make that work. In any case, it’s because a myst code block with curly brackets is really a sphinx directive. That said, they should support the non-directive version, similar to GFM, but would need to embed it. Compared to GFM, though, a plug-in can be added to support plantUML and there’s even crusty ones for graphviz. GFM version is also not particularly flexible for large diagrams