An error occurred while saving the unresolved nucleotides and arrow in the RXN3000 format

[AnnaKosol]

Steps to Reproduce

1. Open in micro mode
2. Add file with nucleotides and other monomers
   Schema nucleotide with sugar with different connections.ket.zip
3. Add a row (Open Angle tool)
4. Save to file in RXN3000 format
5. Open file in RXN3000 format on Canvas

Expected behavior
File is opened without errors

Actual behavior
An error occurred

With other connections is the same situation
Schema nucleotide with nucleotide with different connections.ket.zip
Schema nucleotide with base with different connections.ket.zip
Schema nucleotide with peptide with different connections.ket.zip
Schema nucleotides with phosphate with different connections.ket.zip
Schema nucleotide with chem with different connections.ket.zip

Environment details:
Ketcher Version 2.23.0-rc.2 Build at 2024-07-10; 19:39:22
Indigo Version 1.22.0-rc.2.0-ga21fb5d8f-wasm32-wasm-clang-19.0.0
Chrome Версия 126.0.6478.127 (Официальная сборка), (arm64)
MacOs Sonoma 14.5
Issue found for epam/ketcher#4382