async keyword is removed

[spiffytech]

Describe the bug
When creating an async method on an object, the compiled output does not have the async keyword. New in 3.13.0.

Logs
Cannot use keyword 'await' outside an async function

To Reproduce
https://svelte.dev/repl/da0f4ec5dc8048fdb2f43b97fe203fa3?version=3.14.1

Expected behavior
async function is compiled to an async output

Information about your Svelte project:
Svelte 3.14.1, Webpack, Mac OS Mojave.

Problem replicated in REPL with Svelte 3.13.0.

Severity
I can downgrade to Svelte 3.12 to work around the issue for now, but I'd have to restructure my code to put the object declaration somewhere else in order to upgrade Svelte.