1. Create an empty ASP.NET Core Web API project (.NET Core v2, v3, v5 — doesn't matter, reproduces everywhere).
2. Go to the controller and add the following line of code to the Get action:
string selfLink = Url.Action();
"Cannot resolve action 'Get'" error is shown for no reason.
The code works as expected, a proper URL pointing to the current action is generated.
Looks similar to https://resharper-support.jetbrains.com/hc/en-us/community/posts/115000757944-Cannot-resolve-action-with-tag-helper-and-ActionName-attribute but it is stated as "fixed" a while ago.