Slow saving on version 0.17.0 on DotnetSDK8

[ckangnz]

Our project at work uses DotnetSDK version 8.

I have both dotnet 8 and 9 installed on my machine, and I found installing csharp-ls not installing when I'm in the project directory that uses Dotnet 8. Leaving the directory automatically selected Dotnet SDK 9, and I was able to install csharp-ls 0.17.0 globally.

I found my cs project incredibly slow especially when i hit save. Then realised someone complaining dotnet 8 won't work. #230 so I tried reverting the csharp-ls version to 0.16.0, and it is snappy again.
( I ran dotnet tool install csharp-ls --version 0.16.0 --global)

It looks like 0.17.0 is not backward compatible and only works well with Dotnet9? Is this a bug or intended behaviour?