In MCP class `net.minecraft.init.Bootstrap`, dispenser behaviours are registered for various items. A few of these behaviours (`FLINT_AND_STEEL`, `DYE`, `SKULL`, and `PUMPKIN`) have a boolean to determine which sound effect ("dispense" or "fail") to play - by default these flags are `true`, and when an item fails to dispense it is set to `false`, but never reset back to `true`. This results in the "fail" sound effect always being played after a failed dispense.