There was an issue discovered in NET 8, but still exists in NET 10, despite it supposedly being fixed.

The original (incorrectly closed) issue:
#57746

The problem is with OnLocationChanged() in SupplyParameterFromQueryValueProvider. The list of subscribers can be updated in the middle of a foreach loop. A similar issue was fixed in CascadingValueSource.NotifyChangedAsync() released in NET 9, which is why some thought this issue was fixed.