Cannot continually place blocks while sneaking on current block

With the new 1.2.5 update today I noticed that I can no longer crouch and continually place blocks as I move. I have to place the blocks one at a time as I move backwards.

Replication:

• jump and place two blocks beneath you
• crouch / sneak
• move backwards and put target on side of 2nd block
• hold placement button and start backing up
• notice only one block is placed before having to press the placement button again

Expected behavior:

• I should be able to hold the placement button and blocks should continually be placed while moving backwards. This was working fine in 1.2.3.