There was an issue when copying/moving items from masters older than 2.107.x.y to newer ones.
The problem was caused by the recent change on Jenkins about the use of XML 1.1 (instead of 1.0). This fix forces master to master communications to use XML 1.0 so both new and old masters can talk to each other in the same language.
The compatibility code can be disabled using
-Dcom.cloudbees.opscenter.context.rpc.RPCResponse.xmlv1.disabled=true as a Jenkins startup parameter.
When performing a Move/Copy/Promote operation where the origin master is > 2.107 and the target is < 2.107 the following warning message (preflight check) will be shown to the user: "The receiving Jenkins version is X.Y.Z which is older than 2.105. The Jenkins storage format changed in 2.105 and as such the receiver will not be able to read any configuration created by this version of Jenkins.