sys-apps/usb_modeswitch is available on the author's homepage in version 0.9.5. Renaming the 0.9.4 ebuild worked for me flawlessly. Reproducible: Always
*** Bug 254390 has been marked as a duplicate of this bug. ***
Renaming 0.9.4 to 1.0.0 worked also for me.
Bumped to 1.0.2.