From OTRS ticket: https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom;TicketID=10868548
Steps to reproduce
Search for the City and South London Railway article
Scroll down to the section Extensions to the Clapham... and note that the section header includes a dash between the dates
Open the TOC
Expected results
The TOC presents the date span as 1890-1901
Actual results
The TOC presents the date span as 18901901
Reproduce-able?
Reproducible on an iPhone X