Dark Oak Sign is Black Text. Instead of White Text

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Thank you for your report!
However, this issue is Working as Intended.

The report you have submitted is working as intended: Text on any Sign is black by default. But it can be coloured.

Please note, that mechanics of the game may change between updates.
Things such as graphics, sounds, world creation, biomes, redstone, villagers, and animals may not work the same in current versions.

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It is always black writing no matter the wood type but if you click the sign with white die it will be white text