Fix parameterization of probes

Context was not being copied correctly, so all parameterized probes
got the last attribute value.

Fixes issue #1.
2 jobs for master in 2 minutes and 8 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Docker Build
passed #16178
docker_build

00:01:22

 
  Release
passed #16179
release

00:00:46