Summary:
Target blocks do not emit a redstone signal when hit by the following projectiles:

• Ender pearls
• Experience bottles
• Fireworks
• Fishing bobbers

Steps to Reproduce:

1. Place a target block
2. Place a redstone lamp next to the target block
3. Hit the target block with an ender pearl, experience bottle, firework, or fishing bobber

Observed Results:
The target block does not emit a redstone signal.

Expected Results:
The target block should emit a redstone signal.

Video:
Minecraft 2021-05-07 16-38-21.mp4