So i've worked on it this morning and setup an CHR on proxmox to check your issue.
And i found that if im adding the interfaces while the CHR is running i can't see my added interfaces, but if i reboot the CHR the interfaces are loaded correctly.
Note that i was added 3 type of interfaces
CHR-proxmox interfaces.JPG
CHR-interfaces.JPG
So you just can't add interfaces while the CHR is running.
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