But it isn’t applied? That cost me nearly an hour.
What didn’t help
bin/console clean:cache
composer install
bin/console plugin:refresh
Removing the template from the database table
What helped and why
The data is in the composer.json. Shopware is reading the composer.lock file, which contains all the data from the composer.json files AND more meta-data. And to update the composer.lock you need to run composer update.
Protip:
You can run composer update only on the packages you want to update, this way: composer update customer/* or composer update customer/corebugfix