'Testing Angular 13 Select Fail

I'm getting an error in my dropdown component on fixture cleanup in this sample repo. Am I doing something wrong in my component or test? I have simplified this repo down to just the minimum component with a form group and simple select dropdowns.

TypeError: 'set' on proxy: trap returned falsish for property 'value'

 at DefaultDomRenderer2.setProperty (node_modules/@angular/platform->browser/fesm2020/platform-browser.mjs:642:12)
 at BaseAnimationRenderer.setProperty (node_modules/@angular/platform-browser/fesm2020/animations.mjs:292:27)
 at SelectControlValueAccessor.setProperty (node_modules/@angular/forms/fesm2020/forms.mjs:49:24)
 at SelectControlValueAccessor.writeValue (node_modules/@angular/forms/fesm2020/forms.mjs:6065:14)
 at NgSelectOption.ngOnDestroy (node_modules/@angular/forms/fesm2020/forms.mjs:6155:26)

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'Testing Angular 13 Select Fail

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