Post-2018 messages in archives

At some point in the last few months, the archives of many mailing lists added
messages dated far in the future. For example, pgsql-hackers archives gained
four messages from years 2030, 2032 and 2036:

https://www.postgresql.org/list/pgsql-hackers/since/203011010000/

This disrupts my use of the "Next" link. If you're looking at the last page
of messages and click "Next", you'll get a page with just the latest one
message. Normally, if you refresh that page later, you'll see messages added
after you clicked "Next". With the far-future messages in there, "Next"
brings one to https://www.postgresql.org/list/pgsql-hackers/since/203602080620
which won't get new messages regularly for another 18 years.

Perhaps the fix is to set the archive date to the archives ingest time when
the message asserts a date substantially (15min?) earlier or later. Would
that be an improvement?