Why do I have negative "Active DbContexts"?

I'm using the new event counters in EF Core 5.0. It currently lists -2 Active DbContexts.

How can this possibly be negative? What does a negative count here indicate?

[Microsoft.EntityFrameworkCore]
    Active DbContexts                                              -2
    Execution Strategy Operation Failures (Count / 1 sec)           0
    Execution Strategy Operation Failures (Total)                   0
    Optimistic Concurrency Failures (Count / 1 sec)                 0
    Optimistic Concurrency Failures (Total)                         0
    Queries (Count / 1 sec)                                         0
    Queries (Total)                                                38
    Query Cache Hit Rate (%)                                      NaN
    SaveChanges (Count / 1 sec)                                     0
    SaveChanges (Total)                                             0

This is after identifying and fixing a DbContext leak, where the number reported was in the thousands. I do see the number tick up (to -1) when a context is created, then back down to -2 when the context is destroyed.