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LINQPad 8 can only read code snippets from Visual Studio 2017
LINQPad also picks up any custom snippets that you've written for Visual Studio. These are stored in <My Documents>\Visual Studio 2017\Code Snippets.
I tested. LINQPad 8 will not read User's code snippets from Visual Studio 2019 or Visual Studio 2022. I think these folder paths all should be considered as a default source of the code snippets in LINQPad.
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It should pick up 2019, but there's no check for 2022. I'll fix this in the next build.