There are a lot off threads regarding rear door locks they are a never ending tail of woe
On the twin door there is a 6mm bolt holding outer handle on cunning bit is the thing had\has an anti tamper head e.g. breaks off when tightened well it did on all 3 of ours 7 had to be drilled out.
The rod has a cheap clip to hold it in place, if rod has right angle on the end the clip has either fallen off or broken, that is if my memory is good,.