Not the first reaction on Canvas is saved to RXN when there are several reactions with single and Multi-Tailed Arrows

[ivanmaslow]

Steps to Reproduce

1. Load reaction from KET:
   ket-cascade-single-reactions-without-matching.zip
   

Actual Result

• 1:1 root reaction of cascade is on "Save to RXN" preview:
  

Expected Result

• The first reaction on the canvas 2:1 is displayed on "Save to RXN" preview as it's the first on Canvas

Environment details
Reproduced on RC SA env:

• Ketcher [Version 2.26.0-rc.6] Build at 2024-10-25; 09:57:12;
• Indigo Version 1.25.0-rc.4.0-g8862ccb7e-wasm32-wasm-clang-19.0.0
• Desktop, Windows 11 Enterprise
• Chrome, Version 130.0.6723.70 (Official Build) (64-bit)

Notes

• Another example of file to reproduce the issue:
  ket-single-reactions-2-mta-arrow-pluses-bottom-top.zip
  The reaction with Multi-Tailed arrow were added firstly, after that reaction with pluses - not the first reaction is on save:
  
• Pay attention to case when the second added reaction is the first on Canvas - TBD
• Issue is detected during exploratory testing of Update Save to RXN for cascade reactions feature - Update Save to RXN for pathway reactions #2234