[Autocomplete][4.12.0] - Loading prop does not load combo box

[j-rooks]

Issue summary

Using the Autocomplete component, the loading combo box does not show up despite passing the correct value to the loading prop, see:

Expected behavior

The loading combo box should appear before displaying the list of loaded options.

Actual behavior

The combo box only appears once the options have loaded.

Steps to reproduce the problem

Observed this issue when working on this PR

1. Checkout the above PR and navigate to /admin/payments/account
2. Enter あ in the "Bank Name" input
3. The loading combo box doesn't appear but the list of options appears correctly

Note: The above gif includes the following code before return:

if (loading) console.log('LOADING', loading, value, data);
else console.log('NOT　LOADING', loading, value, data);

Reduced test case

https://codesandbox.io/s/adoring-wescoff-ymzrc

1. Clear the input and enter a then z -> The options are loaded, then the spinner shows up
2. Clear the input and enter z -> loading is now true but the spinner does not show up

Specifications

• Are you using the React components? (Y/N):
• Polaris version number: 4.12.0
• Browser: Chrome
• Device: MacBook Pro
• Operating System: MacOS Catalina 10.15.2

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