Neovim with LaTeX, changed tabstop and shiftwidth leads to error while indenting in .tex files [closed]

I'm very new to neovim and I'm trying to set it up for LaTeX. I've been unable to indent in .tex files after changing tabstop and shiftwidth after using :set to set them both to 4. Specifically, my setup and what I've done are as follows:

Setup:

1. Install neovim and used kickstart.nvim.

2. Installed vimtex and vim-dispatch (following supercharged LaTeX using neovim)

3. Changed tabstop and shiftwidth to 4 using :set.

To reproduce issue:

1. Create a new .tex file.

2. Enter insert mode and press tab.

3. No indenting occurs, and I get the following error:

Error executing vim.schedule lua callback: ...al/share/nvim/lazy/LuaSnip/lua/luasnip/nodes/snippet.lua:1054: attempt to call method 'indent' (a nil value)
    stack traceback:
    ...al/share/nvim/lazy/LuaSnip/lua/luasnip/nodes/snippet.lua:1054: in function 'indent'
    ...al/share/nvim/lazy/LuaSnip/lua/luasnip/nodes/snippet.lua:716: in function 'trigger_expand'
    ...jack/.local/share/nvim/lazy/LuaSnip/lua/luasnip/init.lua:282: in function 'snip_expand'
    ...jack/.local/share/nvim/lazy/LuaSnip/lua/luasnip/init.lua:351: in function 'expand'
    ...jack/.local/share/nvim/lazy/LuaSnip/lua/luasnip/init.lua:394: in function 'jump'
    .../.local/share/nvim/lazy/blink.cmp/lua/blink/cmp/init.lua:341: in function <.../.local/share/nvim/lazy/blink.cmp/lua/blink/cmp/init.lua:341>

This issue does not arise with normal .txt files (i.e., I can entire insert mode and indent empty lines as expected). I've tried adjusting tabstop back to 8 and reinstalling neovim, but the issue persists.

Any help would be greatly appreciated.