Hello,
 
We're experiencing this issue were we have multiple secret texts variable mappings. It seems to start when we have three or more. It also only happens when you configure a job after the mappings have been added. Removing and readding the latest credential seems to fix it.
 
Anyways when you configure the job. The middle mapping will have its specific credential option opted out and net selected. This results in a failed run.
When you do opt in again it opts out the other credential and also fails to load next run.
It seems I have to remove and add it again.
 
We're running on a docker container
jenkins/jenkins 2.396
Credentials Binding Plugin Version 642.v737c34dea_6c2

 

I added some screenshots hopfully this helps explain the problem a bit.