Even in non-void worlds, chests can still flash and be translucent. Not sure what it causing it, but it seems to be something to do with a nether portal or bed being nearby.
Also effects 19W39A, but this won't let me add it as a version
MC-162561
Chests flash
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Can you provide a screenshot, and a way to reproduce this reliably? I'm not able to in 19w40a.