When you smelt cobbled deepslate, deepslate bricks, and deepslate tiles, you won't get a small amount of XPs. This isn't in parity with Java Edition.

Step to Reproduce
1. Place down a few furnaces
2. Smelt cobbled deepslate, deepslate bricks, or deepslate tiles in the furnaces.
3. Collect the output.
4. Repeat from step 2.
---> It doesn't give you XPs.