Fix core MRSP

[flomonster]

fix #6468

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (f53b7f5) 27.87% compared to head (69e8115) 27.87%.

Files	Patch %	Lines
.../osrd/infra/api/tracks/undirected/SpeedLimits.java	50.00%	1 Missing and 3 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev    #6480      +/-   ##
============================================
- Coverage     27.87%   27.87%   -0.01%     
- Complexity     2165     2167       +2     
============================================
  Files          1007     1007              
  Lines        126912   126918       +6     
  Branches       2582     2585       +3     
============================================
- Hits          35379    35377       -2     
- Misses        90041    90046       +5     
- Partials       1492     1495       +3     

Flag	Coverage Δ
core	78.56% <50.00%> (-0.03%)	⬇️
editoast	75.45% <ø> (-0.02%)	⬇️
front	8.65% <ø> (ø)
gateway	2.50% <ø> (ø)
railjson_generator	87.44% <ø> (ø)
tests	81.95% <ø> (ø)

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[Khoyo]

Good catch