It will auto-install and configure any LSPs that it thinks is suitable for the code you're working on. Found that out the hard way when a new experimental Elixir LSP got added which conflicted badly with my existing installed one

2 years ago and still nothing has changed.

https://hackernews.hn/item?id=40902826

That's a link to a hacker news post, which links to a reddit post, which links to https://github.com/zed-industries/zed/issues/12589 if anyone wants to go right to the 'open' issue.