I'm not quite sure what you are saying. I think you are saying that you enabled the cover options in the KoboTouchExtended driver and the covers weren't generated and sent to the Kobo Touch when you sent an epub. But, when you sent a PDF, the cover was generated and sent.
Or are you saying that the device isn't showing and storing a cover image when you send the book? If so, what is it showing?
Now, I don't normally use the cover sending options in the driver, but have used them in the last couple of weeks while testing something else. I didn't see any problems with them. The covers where generated properly, and used by the device. And I haven't seen any problems with the device generating the covers either with any firmware version for a very long time.
Also, for the cover sending, it won't matter whether you use the KoboTouch or KoboTouchExtended drivers. The function is implemented in the KoboTouch driver and the KoboTouchExtended driver just adds other functions that do not affect this. And the cover sending function in the Kobo Utilities plugin, just uses the KoboTouch driver. If one is broken, they all are.
If the problem is with the send to the device, I will need to see a debug log. Run calibre in debug mode with the version in question and send a book with the cover options enabled. Then post the log for me to look at.
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