The GSM8K warm-cache investigation exposed several tiny-extend shapes where compute padding, valid-row selection, last-token collect, and all-gather rerange must stay request-slot aware. These tests pin those invariants without changing runtime behavior.
Constraint: bs>1 tiny extends use page-granular compute slots while only a subset of rows are semantically valid
Rejected: Rely on scalar non-padded token counts for these layouts | valid rows are not always a simple suffix mask
Confidence: medium
Scope-risk: narrow
Directive: Do not weaken these tests unless the replacement path proves equivalent request-slot and valid-row semantics
Tested: Remote pytest test_nsa_cp_utils.py as part of the 263-test CP regression suite
Not-tested: CUDA graph paths; prefill does not use cuda graph in the current CP setup
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