Add/Remove hydrogens doesn't work for Double CIS/Trans bonds sometimes
- Dominant language
- C++
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- Avg merge
- 2d 11h
- Merged PRs (30d)
- 24
Description
**Steps to Reproduce**
1. Load from file using New Project way: [IndigoException - stereocenters - cannot unfold hydrogens for stereocenter without implicit hydrogens.zip](https://github.com/epam/Indigo/files/14604598/IndigoException.-.stereocenters.-.cannot.unfold.hydrogens.for.stereocenter.without.implicit.hydrogens.zip)
2. Press Add/Remove explicit hydrogens button to fold hydrogens
**Actual behavior**
System throws exception: IndigoException: stereocenters: cannot unfold hydrogens for stereocenter without implicit hydrogens
[rc.test.lifescience.opensource.epam.com-1710430657501.log](https://github.com/epam/Indigo/files/14604613/rc.test.lifescience.opensource.epam.com-1710430657501.log)
**Expected behavior**
No exception
**Ketcher version** [e.g. v2.4.2].
- Indigo Toolkit Version 1.18.0.0-g73c32dec3-wasm32-wasm-clang-12.0.0
- Ketcher Version 2.19.0-rc.2 Build at 2024-03-11; 12:30:30
- Chrome Version Version 122.0.6261.112 (Official Build) (64-bit)
- Win10
- Issue found while testing https://github.com/epam/Indigo/issues/1436
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