The side of the grass block is a solid black texture. The biome doesn't matter, although it's just the regular grass block.
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We do not have enough information to find the cause of this issue.
Please take a screenshot of your debug screen (enabled by pressing the F3 key) and attach it to this report.
Additionally, please answer if you have recently encountered a game crash. If so, please also attach the crash report (found in minecraft/crash-reports/crash-<DATE>-client.txt) here.
This ticket is being temporarily resolved as Awaiting Response. Once the requested information has been delivered, the ticket will be reopened automatically.
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I think you have a problem with the game files, try checking their integrity. It is also possible that you have a modified client or have a resource pack.