Forced front Derailleur gearchanges can destroy the split link on a semi-recumbent tandem, when desperately attempting to grab a too late change down on Kinsteep Hill.
Fortunately, stopped quickly enough to not have to rethread the chain through the rear derailleur idlers.
Fortunately also, had found where I keep the general purpose rags (pannier bag pocket) before setting off on that journey.
Unfortunately, my system for supporting the bike with the back wheel above the ground, proved to be flawed on roads where no kerb is available. Got to rethink that.
Need to replace the split link in the spare parts bag.
Late edit 9/9/23 another spare split link put in the spares kit bag on the Pino. 10speed split link should be ok on a 9 speed chain.