md-autocomplete thrown error when using with ngfor

[skyfremen]

Bug, feature request, or proposal:

Bug

What is the expected behavior?

Array should populate based on newly assign array after touching/selecting value from autocomplete

What is the current behavior?

Cannot reassign the array in ngfor after touch the autocomplete control but it working with md-input.

What are the steps to reproduce?

Step 1: Click on Input
Step 2 : Click on button "Click Me"
Expected behavior => No error and array using ngFor has been reassign
Actual behavior=> No error and array using ngFor has been reassign

Step 3: Touch/Select value from Autocomplete
Step 4: Click on button "Click Me"
Expected behavior=> No error and array using ngFor has been reassign
Actual behavior=> Error and array using ngFor not render (hang)

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What is the use-case or motivation for changing an existing behavior?

NA

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Material Beta 7

Is there anything else we should know?

NA

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