When bone meal is used on warped or crimson fungi, they will grow through blocks above them.
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I can confirm this in 1.16 prerelease 5. Unlike trees, which can only grow if a block above them is wood, fungi seem to grow through any block above it, including structure voids, barriers, and even bedrock (although, note: the fungi does not replace the other blocks; rather, it just skips those areas and grows above them).