Treesitter "no parser available ... because lang could not be determined"

[YodaEmbedding]

Have you done all of these?

• I am using the latest version of the plugin.
• I have checked the wiki.
• I have checked previous issues(even closed ones).

Describe the bug
I upgraded neovim from 0.10.0 to 0.10.1. It now gives this error:

Error executing vim.schedule lua callback: .../neovim/0.10.1/share/nvim/runtime/lua/vim/treesitter.lua:97:
There is no parser available for buffer 16 and one could not be created because lang could not be determined.
Either pass lang or set the buffer filetype
stack traceback:
        [C]: in function 'error'
        .../neovim/0.10.1/share/nvim/runtime/lua/vim/treesitter.lua:97: in function 'get_parser'
        ...al/share/nvim/lazy/markview.nvim/lua/markview/parser.lua:812: in function 'init'
        ....local/share/nvim/lazy/markview.nvim/plugin/markview.lua:36: in function 'buf_render'
        ....local/share/nvim/lazy/markview.nvim/plugin/markview.lua:134: in function ''
        vim/_editor.lua: in function <vim/_editor.lua:0>

Neovim version

nvim --version
# Output
NVIM v0.10.1
Build type: Release
LuaJIT 2.1.1725453128
Run "nvim -V1 -v" for more info

Are you using a distro?
No

To Reproduce
Steps to reproduce the bug:

1. Install markview.nvim.
2. Open a markdown document.
3. :bdelete