I've tried to repro on my 5th Gen iPad with iOS 16.7.12 and ST4 Build 1937
I'm getting some of the same issues, but not all. I'm not getting any crashes, but I am able to repro the Crtea Playlist Folder issue.
On Playlists -> 3 ellipses menu -> Add Folder - I assume I'm seeing the same.
Folder name doesn’t appear as I key it in and the dialog box only shows the ‘Cancel’ button
Yep, I'm seeing same. The dialog is missing the Createbutton and only showing Cancelbutton
As I type a folder name in, the cursor in moving to the right as though there are characters in the Folder name dialog, but there are no visible characters. It would be similar to if you were just hitting spacebar.

In above example, the blinking cursor isn't visible, but as you can see from the keyboard, I had typed in Ttttttttttt and what I was seeing was the cursor 10 charcters 'in' to the field as though the charcters were actually there.
In case the characters were there, and it was some sort of UI issue, I tried hitting Enter on the keyboard, but I guess with the Cancel button being sole focus on the dialog, I couldn't get around trying to create a folder.
I did double-check and try moving a playlist but there were no folder (aside from root) to move into so I'm reasonably confident no Playlist folder was created.