questions about using clangd with Helix

[4lsa]

question

I am using clangd (with compile_commands.json) in conjunction with Helix to review an Objective-C project. 
However, I found that the "go to definition" (which always jumps to the .h file) and "go to reference" features 
are not always available in Helix. So, I checked Helix's log and found that the LSP part of the log is strange, 
for example, why the initialization of clangd is logged at the E(rror) level.

additional information

cat ~/.config/helix/languages.toml

[[language]]
name = "matlab"
file-types = []

[language-server]
ccls = { command = "ccls", args = ["--log-file=/Users/alsa/logs/debug_lsp.log"] }

[[language]]
name = "objc"
scope = "source.m"
grammar = "objc"
file-types = [".m", ".mm", "m", "mm"]
language-servers = ["clangd"]

[[grammar]]
name = "objc"
source = {git = "https://github.com/tree-sitter-grammars/tree-sitter-objc.git", rev = "master"}

[the-mikedavis]

We print whatever the language server prints to stderr as error log messages. It looks like clangd is using stderr as a way to print its own logs.