So, I've experienced and seen this happen a few time. Completing bounties in Comp can result in lock-outs until you open your bounty menu or the game registers you completed your bounty. Normal on round based match(which is most of them)
This is a known issue and is being looked into by Bungie
[quote]Countdown and Survival Crucible: We are investigating an issue where players cannot be revived upon death in Countdown and Survival Crucible matches after Update 2.5.1.1.[/quote]
The workarounds mention bounties/pursuits: https://twitter.com/A_dmg04/status/1150110764868354048