The usual kak-lsp troubleshooting procedure might offer some clues:
-
instead of letting Kakoune automatically launch kak-lsp, launch it manually yourself with a specific session name:
kak-lsp --session foobarbaz -
In a separate terminal, run Kakoune with the same session name, so it will connect to the kak-lsp you’ve already started:
kak -s foobarbaz path/to/my/document.latex -
Run
lsp-capabilitiesin Kakoune, and check the terminal containingkak-lspfor error messages.
If that doesn’t provide enough clues, try it again but this time add -v to the kak-lsp command line… or -vv or -vvv or however much additional verbosity you want.