unhandled promise rejection wrongly detected

The following code leads to triggering of the unhandled exception handler, even though it is handled in the catch.
```javascript


async function bla(){
	throw new Error('bla');
}

async function main(){
	setTimeout(()=>console.log('timeout'), 2000);
	try{
		await bla();
	}catch(e){
		console.log('catched', e);
	}
}
main();
```