If your issue involves a crash, please provide the full crash report via PasteBin or Gist, and potentially any log files involved.

#20 Smooth Lighting disabled/"minimum" results in Thatch blocks (and Grove Stone from Roots) appearing to have black "thatch" pieces rather than the coloured pieces expected. Workaround: Currently there is no solution for this. Increasing smooth lighting should resolve it. This issue may also occur with optifine and shaders and may or may not be related to that. This issue was resolved.

#35 Certain combinations of mods can result in Mystical World owls replacing the owls from Bewitchment. Unfortunately, this is not code we have any control over. Workaround: See the linked issue for more details.

#42 Actually an issue with MysticalLib, fences display improperly in inventories. Workaround: None.

#41 Due to the nature of chunk generation, it is possible for multiple chunks to be generating at the same time, each convinced that they are the furthest away from the most recent world structure generation. This may result in a confluence of multiple huts &/or barrows appearing within a small area. Workaround: There is none. This may happen regardless of settings. Potential future alterations involve using trapped chests which spawn monsters as a one-off event, eschewing spawners, and reducing the total loot; additionally increasing the random chance of specific smaller structures will make them less likely to spawn in general; a final alternate is based entirely on a random chance to spawn per eligible chunk, but some heuristic to determine eligibility that isn't CPU intensive is needed.