6.1.0rc1 - matrixify not applying to query B in Mixed Chart

### Bug description

Hello,

I am using Apache Superset 6.1.0rc1

I am using Mixed chart along with the matrixify feature activated with MATRIXIFY flag.
The dimension used to enable the vertical layout of matrixify only seems to apply to the data in Query A but not the data in query B.

### Screenshots/recordings

_No response_

### Superset version

master / latest-dev

### Python version

3.9

### Node version

16

### Browser

Chrome

### Additional context

_No response_

### Checklist

- [ ] I have searched Superset docs and Slack and didn't find a solution to my problem.
- [ ] I have searched the GitHub issue tracker and didn't find a similar bug report.
- [ ] I have checked Superset's logs for errors and if I found a relevant Python stacktrace, I included it here as text in the "additional context" section.