buf beta lsp spins on empty files

[emcfarlane]

GitHub repository with your minimal reproducible example (do not fill out this field with "github.com/bufbuild/buf" or we will automatically close your issue, see the instructions above!)

https://github.com/bufbuild/registry-proto

Commands

echo "syntax = \"proto3\";" > buf/registry/module/v1/commit.proto
nvim buf/registry/module/v1/commit.proto

Output

Blocks the LSP server. Starting from the empty file causes the the SemanticTokensFull to spin. Adding a message doesn't fix it unless we also restart the LSP server with the now non-empty proto file.

Expected Output

Return an empty response if the file is empty.

Anything else?

No response

[bufdev]

Spinning there should really be removed.