Certain parts of the leather horse armor texture are just filled with a blank color.
You can compare it with the bedrock leather horse armor texture to see how it's supposed to look like:
Java / Bedrock
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You can also just notice it in game by comparing it to the other horse armors. You can clearly see these areas are missing texture compared to the other armors types.
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On bedrock the texture looks normal
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Is this report considered as a Parity issue to Bedrock? Because if that’s the case then it is still happening. The more detailed one is from the last weeks Bedrock Beta while the other is from the latest Java Snapshot.