shirsig
commented
9 months ago /aux clear item cache is used to clear the item cache used for search auto-completion. It never cleared the price history (in fact, there is no command for that).
The item value is a historical price based on a median-calculation so it will not necessarily change immediately after a scan, but after a few days of scanning with different prices it will. If it immediately changed to the last scanned value it would be useless as a historical price to compare current prices against (e.g., in the percentage column). If you want the current day's scan value in the tooltip there is /aux tooltip daily.
If you used /aux clear item cache to clear the auto-completion cache it will take a while for it to refill which is probably why that is not working for all items.
As for the autocompletion, it takes a while to refill the cache after /aux clear item cache before it works again for all items.
SOURCE: https://www.curseforge.com/wow/addons/aux/comments
Item value doesn't update after the first scanning with new prices
some items won't autofill
clear cache command doesn't clear the cache anymore so that the value price stays at the very first beginning.
Writing this for Classic SOD & Classic Hardcore