Escape exemplar keys to fix invalid key errors

[dashpole]

Fixes #5936

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.1%. Comparing base (99c3c66) to head (5644ee0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #5995     +/-   ##
=======================================
- Coverage   82.1%   82.1%   -0.1%     
=======================================
  Files        273     273             
  Lines      23615   23616      +1     
=======================================
  Hits       19400   19400             
- Misses      3870    3871      +1     
  Partials     345     345             

see 3 files with indirect coverage changes

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