I cant say specifically - i had a run around with this when starting KDE a while ago (the defaults where annoying). Its one of those things that comes up on forums/reddit regularly where disabling/removing the wallet completly leads to unforeseen problems i.e. having to type out wifi keys after every boot etc. Either setting to only ask once, or there is a way for auto wallet login (with restriction to be same password as user) is simple and gives predictable results.