I'm not sure if this is intented to work as such but in the past you could continously get Suspecious Stews from brown Mooshrooms by having Bowls in the left hand and Flowers in the main hand and keep holding both left and right mouse buttons.

Now this does not work, the game gives only the flower to the Mooshrom and the Bowl in the left hand does not "milk" it afterwards, forcing you to keep switching between slots in order to get it.

Having only Bowl in the left hand works though (for getting Mushroom Stew), just not with a combination with flowers. Is this a bug?

How to test it:

1) Get a brown Mooshroom

2) Get Bowls in the left hand, and any flower in the main hand.

3) Keep holding both mouse buttons while facing the Mooshroom.