I need you to know that I am not denying your experience--but have you tried closing the app and rebooting the iPad? Lots of weird activities in many apps--particularly Notion--are solved by a clean "open."

I think it is safe to say that they are also working hard on an update--not sure when that will come out. They are ALWAYS working in the background, although the published updates seem spread out.

Of course, as someone who uses the iPad with lots of music apps I'm familiar with the regular procedure.

Close the app and then reboot: Done
Delete and reinstall the app: Done
Airplane mode on/off: Done
Try with another iPad (pro 9.7 in this case): Done
And so on...

Nothing worked.

The last thing I wanna do its pointlessly complaint on a forum without being certain, submitted a feedback/support report from within the app but wanted to give the forum a try.

I wanna see this bug fix, hopefully it won't take six months...

So much easier using this app than the whole setup I have to do to use Sibelius on my mac. But for now handwriting is basically unusable.

Sorry to have to ask about the procedure of reboot--but a high percentage of iPad users don't follow that chain of reasoning.

New update today. Check to see if the issues persist! Let us know if they do!

@OP:
Have a look at this video and see if it might solve your issue:
https://www.youtube.com/watch?v=mLzmLf4CKpw