Atom Query feature export: System lost "Implicit H count" values, add Valence value, corrupt layout - export to RXN V2000

[AlexeyGirin]

Environment details (please complete the following information):

• Indigo Toolkit Version 1.18.0-dev.2.0-g369c82f8c-x86_64-linux-gnu-11.4.0
• Ketcher Version 2.17.0-rc.2 Build at 2024-01-03; 17:17:22
• Chrome Version 120.0.6099.130 (Official Build) (64-bit)
• Win10
• Issue found while testing https://github.com/epam/Indigo/issues/1440

Describe the bug System lost "Implicit H count" values or add Valence value

Steps to Reproduce

1. Open from file: Implicit H count4.zip
2. Save it to NRX V2000 file format
3. Clear canvas
4. Load from NRX V2000 file format

Actual behavior Atom Query feature export: System lost "Implicit H count" values, add Valence value, corrupt layout

Expected behavior Works as intended. On that screenshot layout is correct (system doesn't show some values because of https://github.com/epam/ketcher/issues/3529 issue)

[AliaksandrDziarkach]

Provided ket file contains no "plus" entry. Looks like this is ketcher(frontend) issue.

[AlexeyGirin]

Need to be fixed

[AlexeyGirin]

Expected result (same as it works in Marvin). This is for Implicit H = 7

[AlexeyGirin]

Moved to Refined Backlog since no fix over 2 versions