Crash sometime after calling RelevantStage.destroy() in omni.kit.widget.material_preview

Modified the MaterialPreviewProducer slightly but RelevantStage is untouched. Create crashes a couple seconds after the destroy call has finished and returned. I’m guessing it is an event being triggered but have not been able to track it down. Here is the error messages

2021-09-17 22:26:43 [332,945ms] [Info] [carb.scenerenderer-iray.plugin] Shutdown with 0 unreleased Textures.
2021-09-17 22:26:43 [332,945ms] [Info] [carb.scenerenderer-iray.plugin] Shutdown with 0 unreleased Images.
... (Several other messages confirming the destroy fn has finished
2021-09-17 22:26:47 [337,101ms] [Fatal] [carb.crashreporter-breakpad.plugin] gpu.foundation.dll!carbOnPluginStartup
2021-09-17 22:26:47 [337,104ms] [Fatal] [carb.crashreporter-breakpad.plugin] rtx.scenedb.plugin.dll!+0x210bf
2021-09-17 22:26:47 [337,104ms] [Fatal] [carb.crashreporter-breakpad.plugin] rtx.scenedb.plugin.dll!+0x1fb2e
2021-09-17 22:26:47 [337,106ms] [Fatal] [carb.crashreporter-breakpad.plugin] carb.scenerenderer-rtx.plugin.dll!+0x394b6
2021-09-17 22:26:47 [337,106ms] [Fatal] [carb.crashreporter-breakpad.plugin] carb.scenerenderer-rtx.plugin.dll!carbOnPluginShutdown
2021-09-17 22:26:47 [337,108ms] [Fatal] [carb.crashreporter-breakpad.plugin] carb.scenerenderer-mux.plugin.dll!+0x73c5
2021-09-17 22:26:47 [337,110ms] [Fatal] [carb.crashreporter-breakpad.plugin] rtx.hydra.dll!+0x767db
2021-09-17 22:26:47 [337,110ms] [Fatal] [carb.crashreporter-breakpad.plugin] rtx.hydra.dll!+0x74d83
2021-09-17 22:26:47 [337,110ms] [Fatal] [carb.crashreporter-breakpad.plugin] omni.usd.dll!omni::usd::UsdContext::hasPendingEdit
2021-09-17 22:26:47 [337,110ms] [Fatal] [carb.crashreporter-breakpad.plugin] omni.usd.dll!omni::usd::UsdContext::SetBoundingBoxSemanticId
2021-09-17 22:26:47 [337,110ms] [Fatal] [carb.crashreporter-breakpad.plugin] omni.usd.dll!omni::usd::Layers::resolvePrimPathReferencesStatic
2021-09-17 22:26:47 [337,112ms] [Fatal] [carb.crashreporter-breakpad.plugin] carb.events.plugin.dll!+0x5c95
2021-09-17 22:26:47 [337,112ms] [Fatal] [carb.crashreporter-breakpad.plugin] carb.events.plugin.dll!+0x4ff2
2021-09-17 22:26:47 [337,113ms] [Fatal] [carb.crashreporter-breakpad.plugin] carb.events.plugin.dll!+0x66af
2021-09-17 22:26:47 [337,115ms] [Fatal] [carb.crashreporter-breakpad.plugin] omni.kit.loop-default.plugin.dll!+0x8dda
2021-09-17 22:26:47 [337,115ms] [Fatal] [carb.crashreporter-breakpad.plugin] omni.kit.loop-default.plugin.dll!+0x6fca
2021-09-17 22:26:47 [337,115ms] [Fatal] [carb.crashreporter-breakpad.plugin] omni.kit.loop-default.plugin.dll!+0x6d19
2021-09-17 22:26:47 [337,115ms] [Fatal] [carb.crashreporter-breakpad.plugin] ucrtbase.dll!configthreadlocale
2021-09-17 22:26:47 [337,115ms] [Fatal] [carb.crashreporter-breakpad.plugin] KERNEL32.DLL!BaseThreadInitThunk
2021-09-17 22:26:47 [337,115ms] [Fatal] [carb.crashreporter-breakpad.plugin] ntdll.dll!RtlUserThreadStart