When placing concrete powder next to a waterlogged mangrove root block, the concrete powder does not convert to a concrete block.
This is the opposite effect of waterlogged leaves, which do convert concrete powder.
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This is basically MC-188653, mangrove roots just are solid on all sides (making water not touch).
I can confirm this behaviour, although it might be leaves that are incorrect here, since other blocks like stairs also don't transform concrete on the sides that don't have water flowing.