Why is the fletcher package not running on locally installed typst 0.12?

[SillyFreak]

@Amman_Algenib

I am using VSCodium 1.96.0 plus the typst LSP Extension

I suspect this is the problem. Typst LSP is outdated, you should switch to tinymist. Since these extensions bundle the compiler and don’t use whatever you have installed separately, you are likely not actually using 0.12 when working in VSCodium.