/testforblock incorrectly identifies flowing water as normal water

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Steps to Reproduce:

1) Stand in a stream of flowing water

2) Run the testforblock command to check for flowing water at your feet

3) Stand in a block of normal/unmoving water

4) Run the testforblock command to check for flowing water at your feet

Both tests described the block at the player's feet as just "water". The game should have identified the block in the first test as "flowing water."

The non-source water blocks in a stream are correctly identified as "water" by the /testforblock command.

flowing_water is a technical block that the game uses to check for paths where water can spread after it gets placed and after each step of spreading. It only exists while water is spreading.

The different levels of already-spread water in a stream (as shown in the screenshots) are distinguished by different values for liquid_depth in their nbt data.

Ok! I thought "flowing" water was any water that was not a source block.