Melon stems and pumpkin stems are normally rendered as an X with two planes intersecting at 90 degrees. In the latest snapshot one of those planes is not rendering (or is rotated incorrectly). The result is a 2D stem in any configuration (attached and detached both show the same glitch).
It rendered correctly in 14w21b.
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Confirmed.

it misses the other diagonal texture, just like fire, but I reported that already
I guess this is a model error

Despite the similarities between stems and fire (both include an x pattern) they do in fact use different renderers, so if it is the same bug it appears in at least two different places.