Company wants to interview me for a position I hate (after interviewing me for the one I actually want)

After a horrible mental health experience and suffering for 3 years, I ended up getting fired from a job field X. I do not miss it.

I applied for a job in Field Y, which is not my favorite field but it matches my resume and would probably not make me literally die. Interviewed twice, 4 weeks passed, and I've been anticipating an offer every single day.

Today an email came in from a manager in the same company, requesting an interview for a position in field X (the one I hate). I do not want this position, I want the original one I applied for.

How do I position myself as best as possible here? Is there any chance of me getting the original position?

All advice is appreciated.

The original position has been taken down, but a similar one has been posted. Thinking I might apply for the similar one, and mention this to the manager in field X.

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