I don't think it was fixed. I just tested it with a small structure full of custom blocks, but only the vanilla blocks spawned in. Is it perhaps because I was using blocks that I made and not things like spawners? This is supposed to have been fixed. I understand if busy schedules get in the way, but it was said to be fixed in this part of the changelog for 1.8.1:
- [Bugfix #44854] Custom blocks in generated structures not spawning in exported mods
Is my problem different from the fix and not fixed yet or something?
Is this a problem with the structure block in Minecraft itself?
Below is an image of what happens. The structure is supposed to be made of colorful bricks in my mod. Tested this in both the test environment and in regular Minecraft.