No LSP in a project and memory leak

[SuperJura]

Hello,
I am running neovim 0.9.4 with latest omnisharp-roslyn on windows. I installed this using Mason.

I have a 2-in-1 report and I need some help finding the issue.
In a new project, LSP works normally and I have no problem with memory issue.
When openning a big project I can't get LSP to work. I tried multiple solutions and only moving to https://github.com/razzmatazz/csharp-language-server works, but it has it's own flaws.
The project has 510000+ lines of c# code and more than 2000 cs files. It has one sln file and alot of csproj files.

When I :LSPInfo, I get 0 client(s) attached to this buffer Other clients that match the filetype: cs
and most importantly (I think) root directory: Not found.

in :LspLog I only see a bunch of OmniSharp.Extensions.LanguageServer.Server.LspServerOutputFilter: Tried to send request or notification before initialization was completed and will be sent later OutgoingNotification

How can I start debugging this problem?

Second thing is memory leak, when I leave it running, memory fills up and I have to kill nvim (although I have no LSP)

Additionally, when I run the same project in VSCode it works flawlessly without stuttering or memory problems.

[nagaohiroki]

I had the same problem.
I think it's the same issue as #2574.

[SuperJura]

I tried multiple versions with different options, with no progress.

I will leave this issue open for future references, but I have moved to roslyn.nvim for now.
It's VSCode's lsp so it could be better, but I have to test it more.