Export to SVG/PNG works wrong for stereo bonds between monomers

[AlexeyGirin]

Steps to Reproduce

1. Open Molecules (clean canvas)
2. Load from KET: Export to Mol v3000 works wrong for stereo bonds between monomers.zip

3. Export canvas to PNG/SVG

Actual behavior
Stereo bond between monomers shown as single one

Expected behavior
Stereo bond between monomers shown as stereo one

Environment details:

• Ketcher Version 3.10.0-rc.2 Build at 2025-11-19; 05:11:03
• Indigo Version 1.38.0-dev.3.29-g68826ffe-wasm32-wasm-clang-19.0.0
• Chrome Version 142.0.7444.176 (Official Build) (64-bit)
• Win10

Found while tested epam/ketcher#8254