Due to some changes in nvim-treesitter/nvim-treesitter plugin, the https://github.com/practicalli/nvim-astro5/pull/61 only supports Neovim 0.12. The maintainer of nvim-treesitter states that only Neovim 0.12 is supported and has removed the check that made Neovim 0.11 work. This may be https://github.com/nvim-treesitter/nvim-treesitter/discussions/8627#discussioncomment-16440673. It seems the nvim-treesitter GitHub repository is now a public archive, so its not clear what the future is for this plugin at present. I'll keep the https://github.com/practicalli/nvim-astro5/pull/61 open for a few days longer before merging the changes. Perhaps the situation will become clearer. Hopefully it should be self-evident that It pays not to take maintainers of open source software for granted.