Fuel Injector Line, cylinder one not working?

Hello,

It sounds like a possible intentional injector shut down by the engine management system.
This is done when the system detects a misfire on that cylinder and shuts down the injector to prevent over fueling and possible resulting catalytic converter damage.

A good video regarding injector shut down:
https://youtu.be/v9csp3-4VSs
and
https://youtu.be/3plr-FsLwCk

I would suggest to next carry out a CAN-scan using a suitable diagnostic tool

How to:
https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Have you checked the ignition system, coils and spark plugs?

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Cheers, Boris