Vertical scrolling not working

I occasionally have problems with vertical scrolling not working, especially within pop-up windows. I’ve encountered this on Twitter, Coinbase, Freshdesk, and other websites.

macOS Mojave 10.14.6 (18G103)
1.19.86 Chromium: 88.0.4324.96 (Official Build) (x86_64)

Any suggestions for how to fix this (am I missing a setting somewhere)?

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