System shows phosphate as CHEM in antisense chain

[AlexeyGirin]

Steps to Reproduce

1. Go to Macro - Flex mode (clean canvas)
2. Load from HELM: RNA1{R(A)P}|RNA2{R(U)P}|RNA3{R(A)}|CHEM1{[4aPEGMal]}|RNA4{P}$RNA1,RNA2,2:pair-2:pair|RNA1,CHEM1,3:R2-1:R1|CHEM1,RNA3,1:R2-1:R1|RNA3,RNA4,2:pair-1:pair|RNA2,RNA4,3:R2-1:R1$$$V2.0
   
3. Switch to Sequence mode

Actual behavior
System shows phosphate as CHEM in antisense chain

Expected behavior
System shows phosphate as it is

Versions

• Ketcher Version 3.1.0-rc.1 Build at 2025-02-04; 21:27:02
• 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