Lost all my Rune pages. Intended per season, or mistake?

Pretty much what the title says. Loaded into the game today for some quick ARAMs, and it acted as if I hadn't played since the client update. Telling me about Open Party, new loot menus, and when I got into an ARAM lobby, it then told me runes were Reforged and I had nothing but the bad default five to use. Luckily someone else dodged so I could remake all my pages, but still.

Intended, or no?