I don’t see the event about a “withering line” in the new patch notes. I don’t recall getting it before this patch (even when I sorely needed it in the game I lost due to no heir). Lately it shows up a lot, even at seemingly inappropriate times (I an still reasonably young and have two young children). The adopted “heir” slides in at the end of the succession line, regardless of how old they are (I recently “adopted” a woman the same age as the spouse - to which the clerics said “uh, hmmm?”).