Yes this also reminds me of a chat we had on fruit-emu sometime ago with an ex. fruit machine programmer who explained that machines (not Deluxe Monopoly era of course) would detect only one coin input happening over sustained period of time and would then enter into an 'anti-stat's' mode in which the machine would play differently to stop other manufacturers checking other manufacturers gameplay etc. The post was from EdwardB and is a fascinating read for anyone interested : https://www.fruit-emu.com/forums/topic/53948-fruit-machines-inside-out-compensation
Anyway long story short it does highlight the fact that layouts should be, ideally, released with multi coin (and token!) inputs, and when you play them in the emulator you should mix up your coin (and token!) inputs to try and get the machine in as much of a real life state as possible.