Since you're hunting web build issues the one that bites idle games specifically is background tab throttling. Chrome cuts timers back hard once the tab loses focus.
If the honey accumulates by counting ticks then a player who alt tabs comes back to a farm that sat still for ten minutes. If it accumulates off a Date.now delta instead it stays correct and you get offline progress almost for free.
Worth checking before the wider test. It only shows up when someone leaves the tab which is exactly what people do with an idle game.