Rome’s own documents.
Ah yes, I remember this debate with you. We have scant explicit evidence of the early Church's belief on the Assumption so Rome must have changed it! Did any other church complain about the change? No. But still!
Stellar logic that.
Gee, I can't find a photo of myself from January 24 to February 7, 1994 so I must've died then and been replaced with an alien shapeshifter. And then my parents, siblings, and friends just went along with it.