Repair timelinesection <title> : <event> : <details> lines — Mermaid 11's timeline parser expects section <title> on its own line (events follow on the next, indented line as <time> : <event>). When the author squashed everything onto the section line with : separators the parser crashes with Cannot read properties of undefined (reading 'events').
The safest semantics-preserving fix is to drop the section keyword — the remaining <title> : <event> : <details> becomes a valid timeline event line (the visual grouping is lost but every datum survives).
Repair
timelinesection <title> : <event> : <details>lines — Mermaid 11's timeline parser expectssection <title>on its own line (events follow on the next, indented line as<time> : <event>). When the author squashed everything onto thesectionline with:separators the parser crashes withCannot read properties of undefined (reading 'events').The safest semantics-preserving fix is to drop the
sectionkeyword — the remaining<title> : <event> : <details>becomes a valid timeline event line (the visual grouping is lost but every datum survives).