SDK 4.2.1 error editing fonts.

HI.
After upgrading to SDK 4.2.1 I have a problem with the simulator when manually changing fonts.
I created fonts that represent the various icons to display on my watchface.
Now by modifying the icon with any editing program and saving the file in the respective folder, when I apply the save and launch the simulator, the changes are not displayed.
I have to delete the cache folder every time (I have an image attached) to be able to see the changes.