Fangs cannot be summoned on transparent blocks.

When transparent blocks height = 1 block, not spawned fangs.
When transparent blocks height < 1 block, spawned fangs in below the transparent blocks.

This makes evoker almost cannot attacks when player on a transparent blocks.

Affected blocks:

1. grass path
2. farmland
3. snow layer
4. bed
5. all slab(half)
6. end portal frame
7. enchanting table
8. glass
9. all stairs
10. ice
11. glowstone
12. sea lantern
13. stained glass
14. chest
15. ender chest
16. anvil
17. trapped chest
18. light detector
19. shulker box
20. all leaves
21. cactus
22. beacon
23. piston
24. sticky piston
25. TNT
26. cake
27. frosted ice
28. dragon egg