I couldn't on iOS26.1.0 - I even made sure to leave a blank space after the keyword and perform the task in Landscape like the repro video - still worked fine.
Couldn't test on iOS16.7.12 due to previously reported bug about text not displaying in dialog boxes, and the dialog only showing a cancel button.
Riff sorry for the 'captain obvious' first step, but have you tried rebooting your iPad?
Also, you've listed your iPad Air as being on iOS 18.6 - any reason for not updating to iOS 18.7.2 so we can at least get the device on the most recent iOS18 version and rule out any weirdness on earlier iOS versions?