Yogi Mission "Naked and Screaming"
If you use a syringe during the mission, you will get to the end, grab your gear, but the mission complete titles will not appear, trapping you in the mission preventing further progress.
Happened to me over and over until I did not use a syringe.
1. Start mission Naked and Screaming
2. Use any syringe. I used the one to allow me to hold my breath longer and swim faster.
3. Reach the end, Grab Gear
4. Trapped in mission.
When I did not use a syringe, I was able to complete the mission.