With a wireless controller, you can use
(1) Cross button
(2)ZL and ZR
are buggy.
To be more specific
①About the cross button.
•Once pressed, it becomes the same situation as a long press on its own.
•When changing the viewpoint during play (initial placement), if you don't follow the procedure like the Up button ⇛ Up button, it won't react the second time or later.
②About ZL and ZR
•Mainly during survival, but if you touch the stick while pressing zr or zl, the response of zr and zl is interrupted. In short, I can't dig while moving the viewpoint, I can't dig while moving the character.

These are the things I would like to see improved!

This statement is from MCPE-178398
This is a bug that was reported.
I have translated it into English and reported it again, where I am also having trouble with the same symptoms.