First, we’re going to publish this post in MAY, then visit it to create a cache file (including one for June archives).
Then, we’re going to go back and change the date to JULY, to see what happens to:
1) the post page cache file
2) the archive cache file for MAY
(Keeping in mind that updating a post triggers only partial cache deletion. Also skipping a month here just in case adjacency is involved in any potential issues.)
So, the May archive didn’t get wiped out. Let’s test again by setting the date back to May, then coming back and changing it to JUNE instead.