Admob networks fails on cloud build

Hello!
Unity version: 5.6.4p4
I'm getting this error:

for every installed admob mediation network (Vungle, Chartboost and UnityAds).
The error appears only when building on cloud. I have Universal architecture set up at Unity iOS build settings.
The error raises two times for both arm64 and armv7 architectures during the fastlane Unity Cloud Build linking process.

 

This is definitely related to
https://forum.unity.com/threads/ucb-no-parent-for-object.507764/

I don't know what did you guys change in the cloud build for XCode 9.0 but
the post process methods of Admob and Fyber both make xcode projects corrupted.
And this is reproducable only at cloud build. Local Windows and Mac builds are fine.