matrix-project: create-job does not activate touchstone when XML contains <touchStoneCombinationFilter>

[viavi-ab]

Jenkins and plugins versions report

Environment

Jenkins: 2.541.3
OS: Linux - 6.8.0-117-generic
Java: 21.0.10 - Ubuntu (OpenJDK 64-Bit Server VM)
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What Operating System are you using (both controller, and any agents involved in the problem)?

Ubuntu 24.04 server LTS

Reproduction steps

1. Create a new Matrix Project job in Jenkins, tick "Execute touchstone builds first", enter any filter expression, and save.
2. Export the job's XML: ssh -p <port> <jenkins-host> get-job original_job > original_job.xml
   Observe that the XML contains <touchStoneCombinationFilter> with your filter
3. Create a new job from that XML:
   ssh -p <port> <jenkins-host> create-job buggy_job < original_job.xml
4. Open http://<jenkins-host>/job/buggy_job/configure — observe that "Execute touchstone builds first" is unchecked and the filter field is empty, even though the new job's on-disk XML is identical to the source.
5. Reload the job: ssh -p <port> <jenkins-host> reload-job buggy_job
   Open the configure page again — "Execute touchstone builds first" is now correctly checked and the filter is populated.

Expected Results

The newly-created job should be identical to the original, including the touchstone checkbox and status

Actual Results

The newly-created job doesn't loses the touchstone checkbox and status ; more precisely:

• Between steps 3 and 5, the job's in-memory representation is incorrect and it will not run the touchstone build as
  expected.
• If the user saves the job at step 4 before issuing reload-job, the filter expression is permanently lost from the
  XML.

Anything else?

• This is a regression. The expected behaviour is that create-job and reload-job produce an identical in-memory state
  from the same XML. Previously they did; the reload-job workaround should not be necessary. I can dig up an older
  Jenkins version (circa 2025) where this worked correctly if needed for bisecting.
• My use case is create-job via the ssh cli. The same bug is probably triggered via the REST API.
• My AI agent keeps mentioning an XML element <hasTouchStoneCombinationFilter> but I can see no traces of that in any of my matrix jobs

Are you interested in contributing a fix?

No response