Using a redstone item with large lag will return the player to the initial respawn point.

Observed Result

• Continuous use of redstone items that increase lag, such as devices that move large numbers of pistons, will send the player like a teleport to the point, perhaps initial respawn point.

Expected Result

• I think it is inevitable that there will be more lag, but players should avoid being sent to unexpected places!
  What is needed is the current location, but if there is a backup, it is better to be sent to the backup location.
  I don't understand the system, but if you see a level of lag that could cause a jump, it might be nice to alert the player with a message, etc.