Sometimes parts of a repair can "come loose". The key to me is that it sounded like you had been attempting to strengthen your arm in ER and could get no further than 30-45 degrees. Was the therapy focusing on ER strengthening? If you can increase your ER with strengthening then there is not a problem but it is curious why it hasn't up until now. If something is working keep with it. Go on You tube. There are a lot of exercises , many by therapist
The biceps tenodesis and subacromial decompression might add a little discomfort in the 1st month or so but shouldn't affect your strength production
IR is often overlooked. This is part of the motion involved in reaching your arm up your back. The sleeper stretch stretches the posterior capsule and is used to increase the IR motion by stabilizing your scapula.