Neovim lsp functionality doesn't work until after file is edited.

**Describe the bug**
Lsp functionality (go to definition, find references, etc) doesn't work when a .fs file is first opened. Codelens for function definitions show "Unresolved lens ..."

Once I have edited the file and exited insert mode for the first time, all functionality starts working.

The lsp log file shows:
[ERROR][2021-11-14 14:11:16] .../vim/lsp/rpc.lua:462 "rpc" "dotnet" "stderr" "[14:11:16.356 WRN] [LSP] CodeLensResolve - Cached typecheck results not yet available for /home/kcarlton/dev/fsharp/FTest/src/App/Program.fs\n"

**Environment**
- OS: ubuntu 20.04 running in wsl2 on windows 11
- Neovim version: 0.5.1
- dotnet SDK version: 5.0.403
- .Net Framework version: 5.0.12

**Additional context**
Installed with vim-plug. Using nvim-lsp. No configuration set other than keybindings.

It looks like the InsertLeave autocmd is running condelens.refresh(). At this point lsp functionality starts working.
But manually running :lua vim.buf.codelense.refresh() before this doesn't do anything.

If I disable codelense:
let g:fsharp#lsp_codelens = 0
Then the lack of lsp functionality happens. But in this scenario running :lua vim.buf.codelense.refresh() restores functionality.

Plugin is working wonderfully otherwise!
I'm pretty new to neovim. Sorry if I've missed something dumb.