After upgrading stack to 2.3.1 yesterday Haskell support in VScode is severely broken:

• After opening an empty project created withstack new myproject I see "Initializing Stack project" popping on and off in the status bar for many time until it settles.

• After I edit an Haskell file this starts all over again until finally an error indicator appears for e.g. an variable that is not in scope.

• When I fix a problem the error indicators stick around until I close and restart VScode.