I recently had an arena run with Krona Keeper of Eons as my legendary. I had several bottom of deck interactions that did not work correctly. Timeless Causality was supposed to reverse the order of my deck but I was not drawing any cards that had their cost set to 1 for multiple turns. I didn’t play any cards that would have interfered with this interaction.
I had other interactions with older cards that interacted with the deck that were not drawing the 1 cost cards as expected. I did not write these all down.