I'll start by saying that I'm running the macOS Catalina beta, which is almost certainly the root of my problem. I don't expect everything to work perfectly on a beta version, rather I'd like to bring attention to an issue I ran into so it can be fixed before release.
I wanted to edit the format of a counter in one of my patterns, but when I click the counter to open the dropdown system preferences crashes. All I can say beyond that is that it is entirely consistent and may have something to do with the touch bar judging from a cursory glance at the crash log.
Here's a link to the crash report:
https://pastelink.net/ya0u