When in the regular underground, underworld, and dungeon, Torch God's Favor replaces all of the plain torches with bone torches for one player, but for another player all of the torches are replaced with plain torches. The same applies for the aether and aether torches.

When both players are in the same area, this causes the torches to constantly switch between bone and regular.

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Unrelated, but the mod's addition to Torch God's Favor also does not work with biomes added from other mods, such as the Sunken Sea from Calamity.

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I wish there was an option to have the placed torch swap to follow Torch God's rules, rather than by torch luck. This may solve both issues.