Helix build grammar at every boot

Hello,
I have encountered another helix related issue.
My setup is Helix installed through its flake, I use home manager as a NixOS module.
I use impermanence and disko-nix, but the nix store is not wiped at every boot so it shouldn t matter
The problem:
At every boot Helix download all tree sitter grammars from github and rebuild it, taking 3 or 4 minutes.

Expected behaviour:
Helix should download the grammar once and then reuse it for next boots.

the result of hx --health

❯ hx --health
Config file: /home/nicci/.config/helix/config.toml
Language file: /home/nicci/.config/helix/languages.toml
Log file: /home/nicci/.cache/helix/helix.log
Runtime directories: /home/nicci/.config/helix/runtime;/nix/store/a7dwprkxvl95sb3ipj61ix51bymj0zw1-helix-runtime;/nix/store/r7f80a193arnar1p98j3vfg16fv0kwp7-helix-term/bin/runtime
Runtime directory does not exist: /nix/store/r7f80a193arnar1p98j3vfg16fv0kwp7-helix-term/bin/runtime

indeed the folder …-helix-term/bin has a file called hx inside and not a runtime folder but I don t know if that is causing the issue

Thankss