I expected the water in a waterfall to look like it was flowing down when behind glass blocks.
What actually happened was the water behind the glass looked like it wasn't moving
Steps to Reproduce:
1. Place glass blocks directly in front of a waterfall (or any downward flowing water)
2. Look at the water through the glass block
It's a slight difference, but noticeable if you look closely. The water appears to be moving a little but that's due to the flowing on the other side of the waterfall.
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The second picture is with a resource pack that makes glass clear and changes nothing else

Appears to be WAI due to the fix of MC-35790

This is due to a recent bug fix MC-35790
Perhaps this fix should only have applied to source blocks, or even only source blocks which aren't "moving" (as happens when the block beside them is flowing water)

Proposed workaround: Use glass panes instead of glass blocks.