When attempting to replace or test for all forms of water and lava using the fill or execute commands, the flowing varients do not seem to be possible to find. only tested with water; but im sure this happens with lava too.

Expected behavior: flowing_water is able to be found by "execute if block" commands

Actual behavior: errors thrown like that block type doesn't exist.

to reproduce:

1. in game, look at a waterfall with f3 and observe that "looking at liquid" shows flowing_water.
2. go inside the waterfall with plenty of waterfall above and below you and start typing the command "execute if block ~ ~ ~ Minecraft:flowing_water". (capitolization of minecraft may vary)
3. observe the fact that flowing_water is not a known block type somehow; thus making it impossible to test for it in execute commands or replace it with fill commands.