Cannot start dictation when VoiceOver on; I

With VoiceOver turned on, I can’t start dictating text on my iPad mini 5. I tap the dictation icon on the on screen keyboard, and the voiceover promt tells me to double tap to turn VoiceOver on, and to double tab two fingers to turn VoiceOver off. But when I double tap, dictation doesn’t go on. No idea why. I do *not* have this problem on my iPhone 13, where double tapping the dictation icon when voiceover is on turns dictation on just like it’s supposed to. So I’m thinking there’s either a hardware problem, or more likely some weird setting on the iPad that’s different from something on my iPhone, but as best I can tell the Accessibility and keyboard settings are all the same on both devices.

Dictation works just fine when VoiceOver is turned off. iPadOS is fully up-to-date, and I’ve tried all the usual standard stuff, like restarting the device, toggling “enable dictation” on and off in settings, etc. Also tried googling the problem. But no help. Any ideas?