Not if you buffer it from gloomy A/B/K. You can see me buffer it from standing K there. I cut out a lot of the experimentation because it was just me messing around before people came for casuals, but you'll see on stream that block/whiff makes no difference. The biggest conclusion that I came to is to get the A+B to work, you have to time the input to precisely come after the A/B/K has completely recovered.
Any other move it seems to work fine (for example, you can easily buffer 1B, A+B from both stances)
Voldo has something similar to this with his WR A+B. If you do WR A+B too quickly after a move that recovers in crouch, you'll get WR A instead. It's probably one of the things I dislike most about playing Voldo, but it is a challenge mastering the timing for getting WR A+B after a recovering FC move so I feel good when I actually do get WR A+B to come out. It probably misses the untrained eye so it's a self satisfying accomplishment. Anyways, yeah, this buffer system is wonky. /end ramble