Can't see collections in VS2022 debugger in Blazor

I'm debugging a BlazorWASM application in VS2022 - all works well except if I place a breakpoint in the code.

The Autos window will populate with the local variables (including collections) but when I attempt to drill into a collection (a list in my case) I merely see 'Capacity' and 'Count' and no details of the items in the list itself.

I think this only started with VS2022 - v17.4.

Not sure what I'm missing here. More detail:

Runtime: .net 7.0.0Nuget packages: all v7.0.0