When creating an archiveArtifacts step in the BO editor, it has 'DefaultExcludes' (nice user-friendly label) disabled.

This will result in this step:

archiveArtifacts '**'

When checking the box, the step will be:

archiveArtifacts(artifacts: '**', defaultExcludes: true)

AFAICT (JENKINS-20086 makes this difficult) both do the same thing. defaultExcludes is enabled by default, and needs to be explicitly set to false.

Notably, the snippet generator gets this right.