You are not making it easy for us 😁
First we want to say that we appreciate all error reports and testing.
In this case, the sample Job you supplied is too complex. You have external files, Variables and a lot of Tasks. It is also not clear what you are trying to accomplish.
We tried to strip it down to 3-4 Tasks and did not see any evident problems (attached). But at the same time we are not sure what you are trying to accomplish.
I would say that it is nearly impossible to take your Job as it is and even try to reproduce something. It would take hours and the risk that we have another environment/setup than you would be great. If we can focus on the actual problem instead of setting up the environment it would be great.
A test case would preferably not include any reference to any file. This leaves out any chance that there is a problem with reading a file through permissions, that format is strange etc. If you want to reproduce a loop we recommend that you just create a Variable, with a maximum of 3 rows.
For simplicity, in all test cases, just use one column and alway refer to that first column.
Have a maximum of 3 Tasks in an example - not a Task more than that is required to reproduce the problem.
Try to keep the Tasks as simple as possible 😁. Often the problem is the complexity.
Be clear what you expect the Job to do in form of result.
These are just general guide lines and all may not apply to you.
By the way, the Rename Task does not currently report an error when no file is found. However, it will in 6.0.5.