Mac Mini appears on iPad other devices list, but iPad does not appear on Mac Mini other devices list, but other devices such as iphone and TV do appear on both other devices lists.
iPad, iPadOS 16
It's important to know that direct Bluetooth pairing between an iPad and a Mac mini (or any Mac) is typically not supported for general use like file transfer or simple connection, even though both devices have Bluetooth.
What, specifically, are you hoping to achieve through attempting to pair with your iPad and Mac via a Bluetooth connection?
Whilst it is technically possible to do so, be aware that Bluetooth pairing between an iPad and Mac is generally pointless. If your intention is to use Cellular Hotspot features of an iPad's Cellular connection (only available with WiFi+Cellular models with an active Cellular plan), this link is optimally achieved using the native WiFi hotspot connection - this being a largely automated process. Hotspot connections over WiFi offer substantially greater throughput, range and reliability.
How to set up a Personal Hotspot on your iPhone or iPad – Apple Support
iPad will not bluetooth pair with iMac mini
