Output correct values for radius_beam_tangency and radius_beam_tangency_max

[clmould]

Closes #3979

Description

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 46.30%. Comparing base (8a4d67c) to head (e8efeda).

Files with missing lines	Patch %	Lines
process/build.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4037   +/-   ##
=======================================
  Coverage   46.30%   46.30%           
=======================================
  Files         123      123           
  Lines       28961    28961           
=======================================
  Hits        13411    13411           
  Misses      15550    15550           

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[chris-ashe]

Why are these variables not being assigned at the function output where it is called?

[clmould]

Just moved it to where the fn is called