How to force DrainUnvalidated/DrainValidated

We have a crash during DrainUnvalidated / DrainValidated where there is an object in the list that has been GC’d. We’re trying to isolate what object and why but haven’t been able to repro consistently - we’ve tried gc every frame along with extra debugging enabled to track but we’re unable to get the info. Is there a way to force the DrainValidated/DrainUnvalidated more frequently/less frequently?
Or, is there any particular condition we can concoct in order to have the problem occur more regularly?