Reactions are saved with the incorrect quantity of reactants if the continuation of several tails is matched to one reactant

[ivanmaslow]

Steps to Reproduce

1. Add Multi-Tailed Arrow to Canvas
2. Add middle tail and reduce size of spine
3. Add one chemical element to the left of the arrow and one to the right:
   
4. Click on save to RDF and observe the preview

Actual behavior

• Reaction 3:1 is displayed on preview:
  
• After loading of saved file 3:1 reaction is added to Canvas:
  

Expected behavior

• Reaction 1:1 is displayed on preview, after loading of saved file 1:1 reaction is added to Canvas with single arrow

Environment details

• Tested on CI-CD 2237-detect-pathway SA environment
• Ketcher [Version 2.25.0-rc.2] Build at 2024-09-24; 02:30:35
• Indigo Version 1.25.0-dev.1.58-ga966745f-wasm32-wasm-clang-12.0.0
• Windows 11 Enterprise
• Chrome Version 129.0.6668.59 (Official Build) (64-bit)

Notes

• Test is added to xls and have to be automated after fixing
• Issue is detected during exploratory testing of Import/Export of Multi-Tailed Arrow in cascade reactions - Save multi reactions (pathway, single, edge cases) to RDF #2237