I have the same OS and device as yourself but I am not experiencing the same issues when following the steps that cause your app to crash. As annoying as it is, perhaps try uninstalling and redownloading the app?
EDIT: Sorry, I have the iPhone X not XS Max, perhaps it’s a device related issue? I would still recommend the uninstall and re-download option, just to be sure. Sorry
Currently having the same issue on iOS. I knew it was crashing occasionally on Summary page but didn’t know the exact reproducer. Having just tried the one by @tomguthrie, I confirm that it crashes following those exact steps.
It did not happen before - let’s say a few weeks or a month ago.