If your table is approaching transaction ID wraparound, autovacuum will process it regardless of whether it's turned on or off globally or for that table. This is one of the many reasons why running with autovacuum off, instead of tuning it to run smoothly all the time, is dangerous. If you haven't done that tuning, and just turned it off instead, when autovacuum does start anyway to deal with wraparound it will not be adjusted appropriately to avoid interference with activity going on.
autovacuum is running even though it was turned off
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