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I added custom display settings on quite a few content types.
The view mode tabs disappeared. I tried to uninstall third party modules and rebuild the cache, without luck.
What can I try from here? I'm using Drupal 8.0.0-beta15.
The block showing the secondary tab menu was disabled. In order to activate it, I had to pay /admin/structure/block/list/seven a visit and manually re-add the Tabs block to the Pre-content region.
Required, but never shown