If `diagnosticModel` is a `push`, the 2.0.x language server crashes after startup...
~Symptoms observed on `v2.0.2` language server.~
~**Edit**: The situation remains the same with `v2.0.4` of the language server.~
**Edit**: The situation remains the same with `v2.0.5` of the language server. Maybe there is a problem with coc.nvim itself, etc...
~By the way, if `diagnosticModel` is `pull`, the language server works without crashing after startup, but with ` Githubissues.
Githubissues is a development platform for aggregating issues.
~In progress...~ Edit: Done.
This problem has been resolved.