The post has returned again, intact and recategorized as intended.
Here it is: Code flow question due to unexpected code flow.
From its edit history:
EDIT 1:
For reference, see this discussion for accounts of similar occurrences on another Discourse forum: Processing Foundation Discourse: Moved thread has disappeared.
EDIT 2:
Akismet seems to be likely cause of temporary disappearances. See Arduino Forum: Moved topics disappearing?.