Sometimes the table of contents is not generated (doesn't appear in HTML), e.g. here. A null edit solves the problem.
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Description
Event Timeline
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJun 28 2017, 8:14 AM2017-06-28 08:14:33 (UTC+0)
Schnark closed this task as a duplicate of T168040: Table of contents (TOC) missing sporadically without apparent reason.Jun 28 2017, 8:16 AM2017-06-28 08:16:17 (UTC+0)
Legoktm closed this task as a duplicate of T168040: Table of contents (TOC) missing sporadically without apparent reason.Jun 28 2017, 8:16 AM2017-06-28 08:16:34 (UTC+0)