I cloned the TinyCLR-Samples Repo, opened the App CarWashExample and actualized the Nuget References to preview4.
The Intellisense in the project now shows a strange behavior (see picture).
For example it shows error squiggles for the keyword ‘Debug’ although Using System.Diagnostics; is present,
It shows error squiggles for a local int variable with the prompt better to use Var.
Despite the error squiggles the code compiles.
When I set up a new project the error squiggles do not appear.
I think Intellisense should work correct even if an old project is opened.