We noticed that in some conditions (oddly it's on certain browsers) the strokeCap and strokeJoin stop working on some shapes.

It's hard to repro in isolation, so I took a peek at what the CanvasKit Paint->SkPaint glue does and it seems like strokeCap and strokeJoin don't get set when Paint object is resurrected. I could verify if this resurrection is the cause if there were a way to force trigger a resurrect (is there?).

Note that when the SkPaint gets resurrected, the strokeCap, strokeJoin, and strokeMiter are not set. I think this might be the cause of the issue:

https://github.com/flutter/engine/blob/dc848f154b9c5534262e5b8d3f0360a1beafdeb5/lib/web_ui/lib/src/engine/canvaskit/painting.dart#L218-L231

I've been seeing this issue since 1.22, but I'm currently on:

[✓] Flutter (Channel unknown, 1.23.0-13.0.pre, on Mac OS X 10.15.6 19G2021 x86_64, locale en-US)
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Xcode - develop for iOS and macOS (Xcode 12.0.1)
[✓] Chrome - develop for the web
[✓] Android Studio (version 4.0)