Starting with at least 39830, CL releases seem to be messing up Chrome’s graphics rendering to a good extent. (Firefox, however, seems to be doing fine.)
Edit: looks like this doesn’t happen if I disable Chrome’s hardware acceleration. But I like Chrome’s hardware acceleration! 
Interestingly, there’s no such issue on my son’s laptop (a previous generation LG Gram): same Chrome version works just fine with HW acceleration enabled on the same CL version as mine. Go figure!
Looks like the newest official Chrome release fixes the hardware acceleration.
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Update: Every time I run swupd repair
, Chrome’s hardware acceleration goes haywire. The solution is to clear the Chrome GPUCache. Moreover, looks like this holds true for other applications that use GPUCache (such as VSCodium).
The moral: every time after running swupd repair
, do yourself a favor and empty all GPUCache folders on yer hard drive.