Move transmission change in rotation to after detector unstaged

[DominicOram]

Fixes #500

To test:

• Confirm new test works
• Confirm all points in the issue were fixed or new issues raised

[noemifrisina]

lgtm

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.59%. Comparing base (1928954) to head (b1b162a).
Report is 3851 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #504       +/-   ##
===========================================
+ Coverage   57.08%   77.59%   +20.51%     
===========================================
  Files          28       89       +61     
  Lines        3199     6700     +3501     
===========================================
+ Hits         1826     5199     +3373     
- Misses       1373     1501      +128     

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