jt70 on "[Plugin: WP Super Cache] Will Pay: Preload Always Randomly Missing - files made, then deleted later"

I am seeing similar behaviors with the cache truncating unexpectedly. Last night I ran a preload, and almost immediately the cache cleared, but I had already deleted the cache right before. This morning I noticed I had a cache with the stale-est files at about 9500 seconds. I have expiry set at 86400. I just looked again, and the oldest were at 1341. So, it appears to not be linked to the preload for me, and it appears to not be completely deleting the cache. Of note, my garbage collection was set by time and once per day.
So it appears, at least in my case, that the expiry time is not working and it is running garbage collection at unexpected times. I seem to recall something about this in the past where the garbage collection was not able to update the defaults, but it has been a long time.