Prelacement of any preset side connected to another preset wrong - system losts side chain bond

[AlexeyGirin]

Steps to Reproduce

1. Go to Macromolecules mode - Flex mode
2. Load from file: base to base connected two sequences of presets (U) w_o phosphates.zip
   
3. Go to Sequence mode and select left to symbols in view mode
   
4. Go to Library - RNA tab and click on 25mo3r(nC6n5C)Test-6-Ph preset (create it if you don have it - sugar=25mo3r, base=nC6n5C, phosphate=Test-6-Ph)
5. Switch to Flex mode

Actual behavior
System doesn't connect nC6n5C base with and second chain base

Expected behavior
System connects nC6n5C base and second chain base

As per [requirement](https://github.com/epam/ketcher/issues/4878):

.....4.6. If a preset is being replaced with another preset, side connection is preserved if the new preset has the same Rn at the same element within the preset.

Versions

• Ketcher Version 2.24.0-rc.2 Build at 2024-08-14; 19:06:32
• Indigo Toolkit Version 1.23.0-rc.2.0-g6a2a7526a-x86_64-linux-gnu-11.2.1
• Chrome Version 127.0.6533.100 (Official Build) (64-bit)
• Win10

Related issue - #4878