PowerShell: CimInstance is impossible to remove. ObjectNotFound being raised even though it exists

Question

Scenario

When I run:

Get-CimInstance -Namespace "root/subscription" -Query "Select * from __FilterToConsumerBinding"

...It clearly shows this CimInstance exists:

Consumer                : CommandLineEventConsumer (Name = "testConsumer")
CreatorSID              : {1, 5, 0, 0...}
DeliverSynchronously    : False
DeliveryQoS             :
Filter                  : __EventFilter (Name = "testFilter")
MaintainSecurityContext : False
SlowDownProviders       : False
PSComputerName          :

Problem

However, when I attempt to delete this very same CimInstance:

Remove-CimInstance -Namespace "root/subscription" -Query "Select * from __FilterToConsumerBinding"

I get:

Remove-CimInstance : Not found
At test_ciminstance.ps1:1 char:1
+ Remove-CimInstance -Namespace "root/subscription" -Query "Select * fr ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (__FilterToConsu..., Filter = ...):CimInstance) [Remove-CimInstance], CimException
    + FullyQualifiedErrorId : HRESULT 0x80041002,Microsoft.Management.Infrastructure.CimCmdlets.RemoveCimInstanceCommand

I'm at an absolute loss. Clearly this object still exists, why can't it be deleted and why do I get this error?

I verified that with any of the commands below:

Things I tried

Multiple different ways of querying verify the object exists:

Get-CimInstance -Namespace root\subscription -ClassName __FilterToConsumerBinding

Get-CimInstance -Namespace root\subscription __FilterToConsumerBinding  |
  Where-Object -FilterScript {$_.Filter.Name -eq 'testFilter'}

But no matter in what way I delete it, I always get ObjectNotFound. These are some of the ways I've tried to delete it:

Get-CimInstance -Namespace root\subscription __FilterToConsumerBinding |
  Where-Object -FilterScript {$_.Filter.Name -eq 'testFilter'} |
    Remove-CimInstance

$a = Get-CimInstance -Namespace root\subscription __FilterToConsumerBinding
Remove-CimInstance -InputObject $a[0]

How could this be?