If you get rushed, request a hold, use the phrase "unable" or whatever it takes. Some instructors will put you into a difficult circumstance to see what you do.
You must treat it as real world including monitoring duties and speaking up against the captain using crm.

This ^^^
My last sim was a LOFT and we both caught the sim instructor trying to set us up for a “dive & drive” with a runway change after getting us off the arrival.
I’m sorry but this sounds like a good call.

You are speaking out on nonsense. It wasn't on any approach, it wasn't proper because it had a no link and didn't sequence mid flight which I corrected before we ever got there. I am voicing things here because I'm curious if this has happened to others and next steps. I on the line will be with a captain who is qualified for the seat.

Just learn from this and pass the recheck. I don’t think your career is over. I’m concerned with the fact you don’t think this should be a failure for you as well. You’re in a crew environment now. There should be checks and balances. Everyone makes mistakes when flying the line. It doesn’t matter the seat they sit in. I can’t tell you how many times I’ve seen competent captains make mistakes. At the end of the day we’re a team. So, go and be a team player!

I only know what you posted, but again, you need to own it. The examiner felt whatever happened you both deserved to fail. The FMS not sequencing could be a problem if it results in a gross navigation error while you’re 1000 miles from shore in NAT Airspace. Being heads down while the CA makes a wrong turn could be a problem if you bring Chicago Ohare departures to a grinding halt while they look for a tow bar and a tug with a radio to fix your screw up. Missing a checklist item while flying a CAT3 autoland in 300RVR could be a problem. Own it. You deserved to fail.

As far as depending on the fully qualified Captain, he/she is human and can make a mistake just like you. I’m still waiting for my first perfect flight. The idea is that between you and the CA, you can both trap errors and complete the flight...anyone can have an off day, But the other pilot steps it up and keeps things safe.

Pass the re-check, use it as a learning experience, and move forward...you’re not the first and won’t be the last to bust a ride, but the attitude that you didn’t deserve to fail will not help you.

The plane was in an unintended aircraft state during your checkride. Specifically, there was a taxiway incursion at the very least, and maybe a runway incursion depending on where the captain turned the plane. Regardless of the reason, you didn't stop him. That alone is a fair bust.

When you're on the line, you'll run into the same thing. Most captains know what they're doing. There are a handful who don't, and you'll be responsible for making sure that they don't get you violated or worse.

You'll probably find yourself on a slippery slope if you challenge this. Your best bets are to own the failure, learn from it, and not make the mistake again. If you keep the rest of your record clean, then getting an interview down the road with a major shouldn't be as hard as some of these other guys are saying.

I have a 121 failure and I am at a major airline FWIW.
Do well from here on out. Yeah, it sucks. Yeah, you will replay it in your head 1000 times. Yeah, you will make yourself believe it's unjust and shouldn't have happened. I've done all that. I get it. Don't let it eat away at you though and own you.
Make your resume stand out. Overcome it. I did more to get my job than others did because I had to make up for lost points. Let this failure be an opportunity to force you to become an even better pilot and better applicant than the next guy/gal.

By the way.
You can protest a checkride under certain circumstances.
For instance the examiner asked you to perform a task which is not to be tested on.
Examiner also cannot make up their own tolerances.
A checkride is a choreographed dance that is rehearsed and clear to all parties.
They are allowed to give you “realistic distractions”.
Could be anything from a hellacious tailwind to a minor malfunction that requires attention and a change in STAR or runway change.
An accident or incident is never caused by a single event it’s always a chain.
The sim instructor (when you’re rehearsing) and the examiners job is to string a couple of these links in the chain together.
Purpose being is to find out if you have the situational awareness to break the chain.
If you keep stumbling along while the examiner is connecting the links......

If this would have been a real flight you would have been invited for coffee and cookies with the Chief Pilot and your POI. That’s a fail.

But didn't you want to be at FedEx or Ups?

Sure, I’d like to be. But I’m happy where I’m at, and no one knows if those places ever will/would have called. I got an offer at a major airline and I took it.