"Apparently, Intel had indeed found the issue,documented it (see below) and fixed it. There was no direct feedback to the OCaml people, so they only found about it later."
It was acknowledged, and documented in a errata bulletin, but not communicated back to the reporter. Assuming that it had not already been reported, discovered internally, or reported by another source. Seems more like sloppy followup on a bug report, which unfortunately happens in any large project.
Not in this case.
"Apparently, Intel had indeed found the issue, documented it (see below) and fixed it. There was no direct feedback to the OCaml people, so they only found about it later."