The bug
When any type of water is viewed through glass, a solid blue texture is shown, as a result of the fix for MC-35790. However, this fix should only have been applied to non-flowing source water, as water which is indeed flowing looks weird when viewed in such cases.
(On that topic, could still water up against glass be made to display the still water texture for Bedrock Edition parity interests?)
Related issues
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Also affects Bedrock Edition, see MCPE-36563

Is'nt this a feature, so that you can look inside a aquarium? they know people will use glass to look inside a aquarium, and it is very har to look through the flowing texture, so thats why u dont see it.

Why would flowing water be used in an aquarium?
Can confirm in 20w49a.
Can confirm in 20w51a.
Can confirm in 21w05b.
Can confirm in 21w06a.
Can confirm in 1.17.1.
Can confirm in 1.18.1.
Can confirm in 1.18.2 and 22w13a.
Can confirm in 1.19.