So I have been experiencing this very annoying bug for at least 6-9 months now. The game fails to save some of my data, especially my searchterms & -settings at the guildtraders. Everytime I restart the game my list of previously searched items is completely wiped. This hinderes me from using the traders since I usually search for about 10 different items every day.

I already talked to customer support, but they didnt have a solution for me. Their only advice was to delete my local savefiles, which only resulted in a now completely empty trader-list (before that my searchterms showed the same age-old terms I used to use, every time I restarted the game. After I got rid of the savefiles the list is now empty every time), some of my battle-options got removed and the auto-crafting-options at the crafting tables were wiped.

I've re-done my battle-options (which are working ever since) but the trader-searchterms and the favoured settings at the craftingtables don't apply after I restart the game.

I narrowed the error down a bit:
The fact that it did load my age-old searchterms & crafting preferences beforehand shows me that loading gamedata doesn't seem to be the problem here. But saving my data when I close the game is indeed a problem.
I'm playing on the PS5 and I've tried the disc-version and the digital version. I also tried disc-and digital versions on my old PS4 and also deleted & reinstalled everything but the bug is still present on all versions/systems.
I also know from other players that their search-history is not saved too, but also from players where everything works fine for them.

This bug really annoys me at this point. I cant use the traders as I'd like to, which does negatively influence my trading- & shopping-experience.