don't worry, Hijack is lying. i checked every news addressing anything around todays date events like patch-notes, previews, introduction and other news. the news-pages i checked which mentioned evolved stones (ctrl + f) but not regarding a change to the weekly limitation from the winter wonders event:
https://www.bladeandsoul.com/en-us/news/article/7139/substratum-dungeon-preview (ctrl+f evolved stone, 2 entrys: drop-location new dungeon)
https://www.bladeandsoul.com/en-us/news/article/7160/soul-resurgence-patch-notes (ctrl+f evolved stone, 2 entrys: drop-location new dungeon)
https://www.bladeandsoul.com/en-us/news/article/7133/soul-resurgence-items-and-systems-preview (ctrl+f evolved stone, 1 entry: introducing as drop from new dungeon)
no mentions of evolved stones at all, ctrl + f evolved stone, no entrys:
https://www.bladeandsoul.com/en-us/news/article/7091/blade-soul-x-omen-sweepstakes
https://www.bladeandsoul.com/en-us/news/article/7138/introducing-the-new-battle-pass
https://www.bladeandsoul.com/en-us/news/article/7137/soul-fighter-3rd-specialization-preview
https://www.bladeandsoul.com/en-us/news/article/7144/soul-boost-event-more-preview
https://www.bladeandsoul.com/en-us/news/article/7104/soul-resurgence-arrives-january-19
so then, where would the information mentioning the acquisition-change of evolved stones from the winter wonders event to 5 per week be located?
I'm in the same boat as lagertha, farmed a lot for nothing. and no, saying "well should have converted it earlier" is not how that works. if you need an example why this is not how it works, let me know.