When you save and quit, and then load back into the world, a previously placed sculk sensor will be activated momentarily. The same result is achieved when the chunk containing the sculk sensor is unloaded, and then reloaded. Although this is not a problem for most redstone circuits, it is for self-destructive ones, such as those used in TNT Minecart traps. If the player who primed said trap walks too far away, thus unloading the chunk, it is rendered obsolete for any other player who reloads said chunks as they will find the trap already exploded due to the aforementioned momentary on-state upon reload.