Drop lists / combo boxes break after first save

Here is a video of it occurring in the demo (which appears to be 8.7 according to the output in the developer tools):

https://wyliesystems-my.sharepoint.com/:v:/g/personal/r_ewen_wyliesystems_ca/EU7PvOx42thDtDlRMsvAQrQBKIKxSSC5nMWuXH4EHk4p9A?e=DFQLhB

There’s a secondary bug that can be seen in the video as well, which is that the chosen values appear to be lost upon zooming in.