I've just buided something with the new BUD swich and found out something with redstone.
You can see in the first picture the is 1 redstone powder(on Grass). the BUD swich detonates if you destroy it but not if you build it. as you see in the second Picture. If you place or remove a redstone powder(on the Bedrock) the BUD swich detones.

Steps to Reproduce:
1. Build a BUD swich with the new Slimeblock like in the pictures
2. Build 1 Redstone Powder on a cornerblock frome the BUD swich
3. If you destroy it again the BUD swich detonates
4. If you place one more redstonepowder near the first the BUD swich detonates