Have I lost all chances of getting this job?

[Totalk]

I am covering maternity leave and in my contract through an agency I was told I would be following the teacher schedule plus any year 11 and 12 lessons ( as they have left school) will be used for lesson planning.
However the cover manager keeps adding cover in my free lesson.
To start with, she added cover to the first two period (which was a year 11 and 12 lesson which I had initially allocated to plan work). To my surprise as I log in , I find 5 lessons back to back. I emailed her requesting 1 cover be removed but she only exchanged it with a easy group of student.
She is starting to do this more often now.
Today my schedule had 2 lessons and she added another two ( all back to back). When I approached her today, she is like “Oh! Your schedule was very light”
I have worked for other schools and the approach has been very polite. They used to send an email to ask if it was ok to cover with a promise to make it up.
This manager will just send me a cover list which rather comes as a shock.
Am I unreasonable in thinking I should not
have to cover because my contract does not include this?
Also it so happens I have applied for the role of cover supervisor in this school
and if I am successful she will be my supervisor. Have I lost all chances for the job by confronting her today?

Obviously the agency didn't know what your timetable would be then.

If you're covering the absent teacher and she has gain time for years who are out, I think you should expect the extra time to be available for cover. You're there as a cover teacher after all. Standard PPA is 10% of timetabled teaching time, and as a temporary member of staff, I doubt you're being asked to use gain time contributing to next year's schemes of work, setting, transition etc.

It sounds pretty normal to me. All my teacher friends complain about this.

It depends how you handled the situation with your possible future boss. Being a cover supervisor is a challenging job and you need to be able to wing it with last minute lessons. If you show that you are competent in behaviour management and will willingly run to take a last minute lesson, then you should be fine. If it's thought that you won't do all that's thrown at you, the job's not for you.