Per the log:

Error AtlasSystem.cpp:1543: The given sprite rectangle (left_top=0x0, right_bottom=64x64) is outside the actual sprite size (left_top=0x0, right_bottom=32x32).
If this is being used as an icon you may need to define the icon_size property.
See the log file for more information.: bobsflowcontrol-updated/graphics/icon/pipe-brass-elbow.png; mods: bobsflowcontrol-updated extended-descriptions WaterTurret Squeak Through
Prototypes using sprite:
pipe-brass-elbow
pipe-brass-elbow

This issue is related to the update to Flow Control.
https://mods.factorio.com/mod/Flow%20Control/discussion/61b6898e8bfdab791feeaf34
Icon is 32x32 in this mod but the parent mod has updated to 64x64.

Reverting Flow Control back to the v3.0.* made it work again for me.
I will look forward to an update.

So only the icons have to be scaled from 32x32 to 64x64 nothing more?

Yes, looks like it. On Linux I ran these commands in the graphics folder to resize to 64x64, and it works now.

for FILE in *; do convert -resize 64x64 $FILE $(echo $FILE | sed 's/\./-new./'); done
for FILE in *-new*; do mv $FILE $(echo $FILE | sed 's/-new//'); done

Do the Icons look good when you enlarge them by Command?

They're a bit blurry but I wouldn't notice if I wasn't looking for it. Re-making them 64x64 would look better but more work.

And especially I can not draw Icons or something

https://mods.factorio.com/mod/flow-control-expanded-bob this works