bluetooth external keyboard cannot switch languages after update iPadOS 26

I updated iPad OS 26 to my iPad Pro M1. Afterthat all my external bluetooth keyboards are malfunctions

I have Apple Magic Keyboard (Lightning version.) and more 3rd party bluetooth keyboards. The cannot switch between languages after update iPadOS 26.

I tried steps :

• restart ipad after update
• forgot all keyboards and re-pair.

However the keyboards cannot use control + "space bar" for switching languages.

I connect only one keyboard. I disconnect old one before connect new another bluetooth keyboard.

Is there any solutions for solve this problem.