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A caller can observe the marker before a prior materialization finishes but submit work after TaskDeduplicator forgets the completed operation. Recheck marker presence inside the per-key supplier to avoid submitting a second operation that writes a missing marker. A deterministic regression reproduces the null pointer on the old code and passes with the recheck. Joined-task failures still propagate.
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Recheck repository marker presence inside
TaskDeduplicator's per-key supplier: another caller may finish materialization after the initial check but before task submission. This prevents a duplicate operation from writing a missing marker and crashing; callers joining an active operation still receive its result.RELNOTES: None