While commenting on https://github.com/openjdk/jdk/pull/1203 I realized that apparently, after the PR was closed, comments on that PR were still forwarded to the corresponding mailing list thread whereas answers on the mailing list thread were not appended to the PR any more.

I'm not sure if this is intended behaviour or a bug but as the direction from "Closed PR" to "Mailling List Thread" is still working I'm inclined to call it a bug :)

Please compare the mailing list thread "RFR: 8252505: C1/C2 compiler support for blackholes [v24]" with the comments on the PR to see what I'm meaning:

https://mail.openjdk.java.net/pipermail/hotspot-dev/2020-December/thread.html