When you look at a cloud from the outside it shows it's natural shape but when you go inside the cloud it is made of a bunch of boxes linked together. When you look inside it does not match the shape of the cloud outside because it is made of separate squares joined together.
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no, its not mc7882. its a different bug not about corners not connected.

Yes ?
But what is it ?
Outside of clouds: Clouds look like boxes
Inside of clouds: Clocks still look like boxes but from inside.
Clouds are constructed of multiple rectangular prisms (i'll use the 3D shape to avoid confusion). its not about the individual 2D squares' corners not being connected, it's that when you go inside a cloud you can't see the whole thing like it looks on the outside, you can only see one of the blocks the cloud is made of. in the left picture you can see the shape of the cloud. the right picture is the view from inside the cloud (looking the same direction at the same x and z coordinates. you can't see the whole cloud, just one of the prisms it is made out of.

Got it.
But, is it a bug ?

That's not a bug, that's just how 3D clouds work in Minecraft. Seen from inisde, they looked like this even in Minecraft Alpha ...
well, I don't know the actual code it in minecraft, so I can't say entirely for sure, but it sure looks like one.
I have just discovered this myself, and I wouldn't call it a bug.
It is probably not related to the issue mentioned, because we aren't talking about the position, but the way they render.
If I'm not mistaken, Minecraft looks at the texture it is given for clouds, an then renders each pixel from the png inside the world (each pixel representing one "piece" of cloud.
It is perfectly understandable why this is like that, and it was most likely intended. However, to the regular player, it is considered a bug, as noone would expect clouds to be smaller inside (reverse tardis perhaps?).
It would be a nice addition to the game if connecting cloud pixels were rendered as one, but this is outside of the bug tracker's purpose.
Can confirm in 21w05b.

Can confirm in 1.17.1.

Can confirm, video attached

I request this be reopened. Clouds were reworked in 25w16a and they now have 128 chunk render distance. The unnecessary quads inside the clouds could contribute to an extraordinary ammount of wasted processing power if they’re not being culled.
It may also be easier to fix now that the clouds have been reworked so whatever forced a wont fix resolution years ago may not be the case anymore
Minecraft = Blocks = Boxes !?
Or are you refering to MC-7882 ?