Signature help not select correct overload for partially completed function

From https://github.com/microsoft/vscode/issues/80570

TypeScript Version: 3.7.0-dev.20190907

Search Terms:

• SignatureHelp
• parameter hints

Code
For the code

declare function addEventHandler(event: "onPlayerJoin", x: number): void;
declare function addEventHandler(event: "onPlayerQuit", y: string): void;

addEventHandler('onPlayerQuit')

1. Trigger signature help after the closing ' in the call to addEventHandler

Expected behavior:
Signature help for the second overload is returned

Actual behavior:
Signature help for both overloads is returned. We end up showing the one for onPlayerJoin first

Reproduce the issue using the declare function overloads and trigger signature help after the closing quote in addEventHandler('onPlayerQuit'). No file or test is named in the issue; done means signature help selects the second overload rather than presenting both with the incorrect overload first.