When you using command
/summon FallingSand ~ ~1 ~ {Block:flower_pot}
The under of flower pot has no dirt texture.
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[media][media]


You should never be able to see the bottom of a flower pot under normal conditions.
Forward-resolved to MC-120335. There are only two incorrect UV values in the model file which cause the downside of the flowerpot to render a transparent part of the texture.