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Recently I closed a question on the Stack Overflow PT as duplicate, and this question was bumped to the home page, as can be seen in the images:
Close banner with timestamp:
Homepage with timestamp:
However, according to this post, closing is no reason for a question to be bumped.
What could have happened in this case? There was no editing in the post before or after the closing or until the publication of this question.
In addition to closing the question (which didn't bump on its own), you edited the list of duplicates:
As this is a new-ish feature, it is likely that it caused the last modified date of the question to change.
In one of the answers in the feature announcement, this behavior is also described by @muru:
While the revision history has the change, the post itself shows no indication that the dupe target has been changed. So, we have "modified by muru" in the active questions page, but if you go the question, no change anytime in last year.
