A new bug with Satchel Charge:
If you die right after using it, then, when you respawn, another INVISIBLE Satchel Charge will spawn at your position and detonate when countdown comes to zero.
Example: https://youtu.be/n2vhnxPj9Q4?t=9870
Possible reason: countdown to detonation doesn't stop if Satchel Charge exploded earlier because of taken damage.