Or the crew simply take whatever they need that shall be enough for themselves and dump the rest.

A whole decade ago we flew with Air Canada YYZ-HKG (1 stop via YVR) on their old A340-300s. First leg to YVR we were told that there'll be a technical stop at Calgary (think it was a fuel diversion caused by nasty headwinds). Then the scheduled YVR stop. Afterwards as we were somewhere over the Pacific the captain told us that we'll be diverting into ICN due to a typhoon in HK. Finally got going again after a while (couldn't remember how long). At that point it should've been time for the second meal, but the crew said that it has been "expired" so they can't be served to us. And it certainly didn't help when the limit of crew hours were reached resulting in yet another diversion to TPE.

Perfect case of how hunger turns into anger for the pax.