There was a topic about this created shortly before the forum reboot, hoping to bring some more attention to it and possibly resolve it or find a workaround.
Playing on PS4 trying to complete all Mumbai challenges, the only one left is Feeding the Birds, which will then complete Culinary Trip as well.
During the mission, challenge progress is tracked with pop-ups as usual, when checking challenge status at the end of the mission, standing at an exit, but before leaving, it shows as complete. However, once the mission is exited, the challenge does not save as complete. This has happened on a couple of other challenges throughout the game (I can’t recall which specific ones) but the community has always come up with a workaround.
I have done a bit of research and found a couple of ideas. One suggested that doing any saving/loading bugs it, and another suggested that using an emetic item that was released after the release of this challenge pack bugs it.
I have just completed the challenge, and mission, with no loadout, from the default starting location, using only rat poison picked up in level, in a single continuous playthrough. It still didn’t save the challenge progress after exiting the mission.
Any ideas on what to try next?