when entering non-source block water, you are unable to swim. (by swim I mean use the sprint key underwater to move faster.)
Also does not play water splash sound effect upon entry.
Please note that I am not saying water behaves like air. You can still swim in it, just not sprint-swim in it unless it is a source block.
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Please read the description of MC-129358 and you'll see how it covers your described issue.
I am not stating that flowing water acts like air. It behaves entirely like normal water, just except that you can't swim in it unless you enter from a source block.