Is AddDbContextPool supposed to release contexts from the pool?

### Question

I have a large context model, so I'm experimenting with context pooling.

My current setup is:

```
service.AddDbContextPool((provider, optionsBuilder) =>
{
AppDbContextOptionsFactory.Get(optionsBuilder);
});
```

When I run my app, everything seems to work ok, except the `active_dbcontexts` seems to indicate the pooled dbcontexts are created but never released. Is this the expected behaviour for this?


From debugging with EFCore symbols, it appears that `AddDbContextPool` uses a `ScopedDbContextFactory` that does not allow the lease to be released because `IsStandalone` is set to false.

### EF Core version

9.0.0

### Database provider

SqlServer

### Target framework

.Net 9

### Operating system

Windows 10

### IDE

vs 2022