Important | Music Studio on iPhone using iOS 13

I opened Music Studio after a long interval.
As I tried to import SMF from email, the screen of the app looked a bit strange on iPhone Xs MAX(iOS13) and was not working.
I remember it was working well last month…

Since I misunderstood that my operation to import SMF was wrong, I re-installed this app (despite it may lead to the loss of some files).
But nothing was improved from the situation before.

Should I understand that this is the problem described here?
How long should I wait until this bug is fixed?