I have two questions regarding ZMQ raw block notifications:

1 - The default high watermark for bitcoin core is 1000. If I understand correctly this means that up to 1000 raw blocks can be stored in memory (send buffer), which could translate to approximately 2GB, if there is a subscriber who forgets to read the notifications. This may lead to a crash due to insufficient memory in many machines, so it would be safer to set it to 100 and that would still allow the notification subscriber to be ~14h late in reading them, correct?

2 - It seems like raw block notifications are not published twice for the same height. An issue was just published on the bitcoin repository, but there are no comments yet: https://github.com/bitcoin/bitcoin/issues/20376 . Is this expected behavior or a bug?