You might have something there, I do remember them being tightly packed.
When I refitted our bathroom I had installed the normal leak detection cables from Tuya (as Sonoff did not offer them at the time) so I’ve now soldered these cables onto the Sonoff leak detector as they’re inaccessible inside the floor and used the new cables where they are accessible.
BTW the Tuya ones absolutely chomped through batteries, so the Sonoff Zigbee version is a massive improvement overall.