(Android) Can't place Divining Rod into holder in adventure mode

[sixtylilies 0]

I've just reached the teleportato at the end of chapter 1 in an adventure mode run (King of Winter, if that matters). The teleportato is assembled, but I cannot place the Divining Rod into the lock. I've tried dragging and dropping, tapping the lock, and standing as close to it as possible and long-pressing the rod for a context menu. Tapping the lock just results in examination text. Trying to drag and drop does nothing. I'm not sure if this is a bug or I'm just missing something incredibly obvious?

Moto G6
Model #XT1925-6
Android version 9
Motorola