Micro and macro structures connected through attachment points can be saved in CML format but cannot be opened

[Zhirnoff]

Summary
Micro and macro structures connected through attachment points can be saved in CML format but cannot be opened

Steps to Reproduce

1. Open Ketcher.
2. Draw a benzene ring
3. Add an attachment point to the benzene ring via right click menu
4. Switch to Macro mode and connect attachment point to a macro structure
5. Switch to Micro mode
6. Save structure in CML format
7. Open saved file

If it is not possible to draw the structure, then you can open the prepared file (you just need to open it in macro mode and then switch to micro mode):
ketcher (53).zip

Expected behavior
Micro and macro structures connected through attachment points can be saved in CML format and can be opened

Actual behavior
Micro and macro structures connected through attachment points can be saved in CML format but cannot be opened

Saved file: ketcher (4).zip

Desktop (please complete the following information):

• OS: Windows 11
• Browser Chrome
• Version 124.0.6367.79 (Official Build) (64-bit)

Ketcher version
[Version 2.23.0-rc.1]
Indigo version
[Version 1.22.0-rc.1]

Refers to feature: epam/ketcher#4530
Found when testing: #1990

[AliaksandrDziarkach]

Expected fixed

[Zhirnoff]

Tested. Bug not fixed. After load CML file structure looks like (see screenshots)
Original structure

After load CML file

Saved CML file
ketcher (9).zip

Desktop:

• OS: Windows 11
• Browser Chrome
• Version 131.0.6778.205 (Official Build) (64-bit)

Ketcher version
[Version 3.0.0-rc.1]
Indigo version
[Version 1.28.0-rc.1]

[Zhirnoff]

After discussion with @vanoprenko @AlexanderSavelyev @AliaksandrDziarkach it is not high priority bug for now.