Add/Remove explicit hydrogens feature changes R special atom (pseudoatom) to R# (that is invalid)

[AlexeyGirin]

Environment details (please complete the following information):

• Indigo Toolkit Version 1.18.0-dev.4+1452.0-gaf1efce67-x86_64-linux-gnu-11.4.0
• Ketcher Version 2.18.0+dev.1 Build at 2024-01-11; 13:21:50
• Chrome Version 120.0.6099.130 (Official Build) (64-bit)
• Win10
• Issue found while testing https://github.com/epam/Indigo/issues/1436

Describe the bug Add/Remove explicit hydrogens feature changes R special atom (pseudoatom) to R# (that is invalid)

Steps to Reproduce

1. Load from file: R Atom.zip (unzip first)
2. Press Add/Remove explicit hydrogens button

Actual behavior

Expected behavior

[AliaksandrDziarkach]

It is not a query-specific issue

[AlexeyGirin]

Moved to Refined Backlog since no fix over 2 versions