System shows unnecessary - symbol opposite to peptide

[AlexeyGirin]

Steps to Reproduce

1. Go to Macro - Sequence mode (clean canvas)
2. Load from HELM: RNA1{R(A)P}|RNA2{R(A)}|RNA3{R(U)P.R(A)P.R(U)}|RNA4{R(T)P}|PEPTIDE1{E}|PEPTIDE2{E}$RNA4,RNA3,2:pair-5:pair|RNA4,PEPTIDE1,3:R2-1:R1|PEPTIDE1,RNA2,1:R2-1:R1|RNA1,PEPTIDE2,3:R2-1:R1|PEPTIDE2,RNA4,1:R2-1:R1$$$V2.0

Actual behavior
System shows unnecessary - symbol opposite to peptide

Expected behavior
System shows no unnecessary - symbols

Versions

• Ketcher Version 3.1.0-rc.2 Build at 2025-02-07; 15:09:23
• Indigo Version 1.29.0-rc.1.0-g2e30df8f7-wasm32-wasm-clang-19.0.0
• Chrome Version 133.0.6943.54 (Official Build) (64-bit)
• Win10

Issue found while testing: #5942