fix: clarify dispatch for preparation

[gdalle]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 99.23077% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.00%. Comparing base (435dea6) to head (c83ba21).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...iationInterfaceChainRulesCoreExt/reverse_onearg.jl	0.00%	1 Missing ⚠️
...ractorExt/DifferentiationInterfaceDiffractorExt.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #746      +/-   ##
==========================================
- Coverage   97.89%   97.00%   -0.89%     
==========================================
  Files         128      124       -4     
  Lines        7356     7349       -7     
==========================================
- Hits         7201     7129      -72     
- Misses        155      220      +65     

Flag	Coverage Δ
DI	97.77% <99.23%> (-1.16%)	⬇️
DIT	95.04% <ø> (-0.20%)	⬇️

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