`In org.hippoecm.frontend.plugins.reviewedactions.VersionWorkflowPlugin there's a check on presence of an underscore in the project's namespace prefix to hide the Restore-button.
The check is there since Sept 2009, see https://code.onehippo.org/cms-enterprise/brxm/commit/eeaf997980afc11c3377f49695cc7c72a63b92a5#ca0919cf645df88811d382656a480273dc308c24 stating "disable restore action when version cannot be restored".
However, a restore action does work on 13 and 14 for this case (already tested it out using my_project14.2.2.zip that has my_project namespace prefix).
For reference, code is this
Let's remove the check.