Ambiguous phosphates (alternatives and mixed) in sequence shown as `%` symbol instead of `@` symbol

[AlexeyGirin]

Steps to Reproduce

1. Go to Macro - Sequence mode (clean canvas)
2. Load from KET: Ambiguous phosphates (alternatives and mixed) in sequence shown as % symbol instead of @ symbol.zip

Actual behavior
Ambiguous phosphates (alternatives and mixed) in sequence shown as % symbol instead of @ symbol

Expected behavior
Ambiguous phosphates (alternatives and mixed) in sequence shown as @ symbol

Versions

• Ketcher Version 3.2.0-rc.2 Build at 2025-03-17; 17:37:12
• Indigo Version 1.30.0-rc.1.0-g9bdedaba9-wasm32-wasm-clang-19.0.0
• Chrome Version 134.0.6998.89 (Official Build) (64-bit)
• Win10

Issue found while testing: #5942

[SefaBilgii]

This issue is reproducible

Ketcher Version: 3.7.0-rc.1
OS: MacOs Sequoia Version 15.5
Browser : Chrome Version 138.0.7204.169
Indigo version 1.35.0-rc.1.0