Steps to Reproduce
- Edit a contact via default address contacts app
- Add a “custom” messenger type and give the type a name, such as “Ring”
- Enter an ID such as “ring:0123456789abcdef”
The contact should sync as usual.
Sync fails on PUT request (synchronisation phase 4) for the edited contact.
CyanogenMod 13.0-nightly (not up-to-date though)