Normally block outlines are gray or black, but when pointed into the sky, they're blue (ignore the missing chunk blocks)
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Aren't block outlines meant to be partially transparent anyway? (I'm not sure what's up with the invisible block, though.)
Block outlines have always been semi-transparent, apart from a couple of 1.15 snapshots (MC-161267). But that ticket was assigned "important" priority and promptly fixed, so it's safe to say the transparency is intended.
Could you upload a screenshot of the bug occurring, with the F3 screen enabled?