Even though the text doesn't show it, this was ruled a Safety for Jacksonville, which is why Miami then kicked off to them. So it appears to me that Washington got the pick, returned it to the goal line, fumbled it, the ball went into the end zone and was recovered by Miami player Jacobs in the end zone.
You can see the score is updated from JAX 0 MIA 13 to JAX 2 MIA 13 as part of this play.
Game Log:
2-18-MIA 25 (0:33) 1-Taylor Greer pass INTERCEPTED by 23-Thomas Washington at MIA 29. 23-Thomas Washington to MIA 0 for 28 yards. 23-Thomas Washington FUMBLES (49-Byron Jacobs) JAX 2 MIA 13