A check that runs after the house can void the round is not a check. Pause, void and re-roll are the three words that undo every other promise.
If a site can stop a round after you click, it can choose which results stand. A voided round erases the evidence along with the loss, and a re-roll gives the house a second draw you never agreed to. Seed checks verify the rounds that settle. They say nothing about the rounds that quietly disappear.
Once you click, the result should be settled from the seeds committed before that click. No pause button on the house side. If a round genuinely fails, it should be logged, explained and refundable, not silently re-run. Read the terms for the words void, suspend and cancel, and check who gets to use them and when.
If you would like to learn more about the technical workings of provably fair algorithms, you can download the whitepaper.