What ultimately controls the port that is generated into urls for Twill ?

[adam-jones-net]

I've got a .env file and a twill config file that both define the APP_URL as http://localhost:8002. My twill install works fine on localhost in general, however the media picker/browser popup interface produces broken images for all the thumbnails as it's writing localhost:8001 into the src urls of all the image tags.

How can I make it write localhost:8002 ?

Just to clarify; php artisan config:clear doesn't help.