Create a multi-configuration (Matrix) job with some axis.

Go to an axis -> There appears a schedule build link

Schedule a build for this axis -> It appears in the build history as pending

Once the scheduled time is reached the entry disappears and in the Jenkins log one can see

2024-03-26 20:34:03.809+0000 [id=245]   WARNING h.matrix.MatrixConfiguration#newBuild: JENKINS-26582: ignoring apparent attempt to trigger matrix/label=green without its parent

 -> schedule build should not inject the link in the action factory to any kind of Job, but only for TopLevelItems (assuming that for other project types the have subprojects same limitation exists).