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[Please describe this bug in as much detail as possible so we can replicate & debug this bug]
After update to 2.01 from 1.12.4 my taxonomies stoped showing. I have 2 tabs. The loop of the first tab works fine. And the loop on the second tab dissapeared. It is still possible to see it in the code.
Please replace the block element by adding a new one and put the <li> inside and see if it fixes the issue. You have probably duplicated the tab-pane block and indented it so that the .tab-pane class is preserved. Theoretically, this should have been the case in 1.12.4