Last week I completed the associated objective (1,200 kills with rocket launchers or linear fusions) for unlocking the ability to focus Chosen Destruction engrams, while having 0 available Tier III engram focuses. The Prismatic Recaster acknowledged the completion, but the option to focus stayed locked, even after the reset and even after getting 5 hammer charges. I'm able to focus other Tier III engrams, but not this one.
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Hey, Thanks for the report. This is a known issue, and should be fixed by the hotfix scheduled for this coming Tuesday. Source: https://www.bungie.net/en/Explore/Detail/News/50129