If you look at Home › Tools (cgi-bin/koha/tools/tools-home.pl), 'Rotating Collection' does not show among the available cataloging tools. If you navigate to another tool, e.g. Home › Tools › Batch item deletion (cgi-bin/koha/tools/batchMod.pl), you will see the link to Rotating collections on the left bar, pointing to cgi-bin/koha/rotating_collections/rotatingCollections.pl.
It shows for me in both spots - the tools main page and the tools sitebar. Maybe different permission checks?
Works for me and the permissions are the same. Reopen if it persists.