[Bug][getAllModels] OperatoinStatus not found even filter-out-core-models : false

[archerzz]

Describe the bug
I bumped to typespec 0.52.0 (along with tcgc 0.38.9).
See cadl-ranch LRO test case: https://github.com/Azure/cadl-ranch/blob/c611311c3d36a3048a3077137cbd4e6be762d034/packages/cadl-ranch-specs/http/azure/core/lro/standard/main.tsp#L217

getLroMetadata return the finalEnvelopResult as OperatoinStatus which is a foundation type. But you cannot get it through getAllModels() even I set filter-out-core-models to false.

To Reproduce
Try to parse the cadl-ranch test case with filter-out-core-models: false.

Expected behavior
I understand OperationStatus should be found.