(mod versions not listed since I'm referring to the GitHub source code directly)

Relevant line of code is here:

This normally isn't a problem for most players since the default resources are fairly simple shapes, but our custom modifications to the multiplayer screen also get applied to the JEI display for the laser drill, which in our case results in some confusion for players since it's no longer a cross. Since these icons are intended to represent server compatibility (in the case of the laser drill JEI integration, the "Bad, FML" icon), they probably shouldn't be used elsewhere.