This isn't a bug. Its a freature added in 1.5. It gets the status of the repeater "staying". So if the repeater facing away is off, and you activate the repeater facing right, bedrock appears. Then whatever you try activating the RFA (repeater facing away) it wont activate. Opposite for activated RFA. If its activated, and it get blocked by the bedrock, it stays activated, but if you try deactivating the RFA, it still stays active (as well the redstone going with the direction of the repeater). So it isn't a bug, just a 1.5 freature.
Bene Dániel
This isn't a bug. Its a freature added in 1.5. It gets the status of the repeater "staying". So if the repeater facing away is off, and you activate the repeater facing right, bedrock appears. Then whatever you try activating the RFA (repeater facing away) it wont activate. Opposite for activated RFA. If its activated, and it get blocked by the bedrock, it stays activated, but if you try deactivating the RFA, it still stays active (as well the redstone going with the direction of the repeater). So it isn't a bug, just a 1.5 freature.