Relates to MC-177516, MC-162518, MC-173384
As these blocks are made of obsidian, a dragon-resistant material, they should be immune to dragons. However, this is not actually the case, as they are not part of the tag in question and as such can be destroyed, which is very counter-intuitive.
Blocks in the inventory are no longer shaded properly
Crying obsidian can be destroyed by the Ender Dragon
Respawn anchor isn't in the #dragon_immune tag
Iron and below pickaxes will drop enchanting tables and ender chests when broken, despite being made out of obsidian