When purchasing additional bounties from Zavala, I saw that after two consecutive purchases only one bounty was actually acquired. Notice in the video that I started at ~115k glimmer (after dailies) and after five additional bounty purchases I end up with three and ~100k glimmer. Bottom line: I was charged 15k glimmer for five additional bounties, but two ghosted and I am left with three. If I exited Zavala's menu after purchasing and interacted with him again, the additional bounty was acquired as expected.
Clearing the console cache by powering down and leaving the hardware unplugged for at least 5 minutes, or clearing the Download Cache and verifying the game files via Steam, could potentially help correct these kinds of issues. If it does not, Bungie is aware of the issue and investigating. https://www.bungie.net/en/Help/Article/12539