Stained Glass Chunk rendering

Please provide a screenshot of this occurring with your F3 debug screen enabled.

I have a feeling this might have something to do with the client maybe not being vanilla?

I could not reproduce the issue but found a similar issue with the Fabric client (see screenshots with red / yellow glass).
In vanilla you can see all of the borders where different kinds of stained glass touch. Fabric (or some mod I have installed - not sure) doesn't display these except on chunk borders.

In that case this would not be an issue with vanilla Minecraft but with Fabric or one of the mods I am using. @Mark Morosan can you confirm whether you are using vanilla or another client?

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