core: fix bugs where we would fetch data an epsilon too far #3511
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Fixes #3509
Only one of the two bugs has been reproduced in a fuzzer regression test. The other can easily be reproduced on France (and has properly been fixed), but it doesn't seem to appear on a generated infra. I suspect it only happens on very long paths, in which case we should eventually add a generated infra with extremely long tracks for better tests.