Rest element type not recognized for inner array types

Bug Report

Hello,
The compiler doesn't recognize an inner array type as an "array type" when inferred in a conditional type.

🔎 Search Terms

I searched for array, rest element, inner array type, multidimensional array type.
Couldn't find anything.

⏯ Playground Link

Playground link with relevant code

💻 Code

The compiler complains with the following code:

type PushToTopArray<T, ArrayOfArray extends any[][]> =
	ArrayOfArray extends [infer TopArray, ...infer Rest] ?
		[[T, ...TopArray], ...Rest] :
		never;

🙁 Actual behavior

with error: A rest element type must be an array type. (2574) on ...TopArray.

🙂 Expected behavior

But since ArrayOfArray extends any[][], the inferred TopArray should be of type any[] and therefore satisfy the rest element type.

Start with the linked TypeScript Playground reproduction and confirm the error on the inferred TopArray rest element in the conditional type. Trace the compiler's conditional-type inference and rest-element validation, then add coverage showing that the inferred inner array is accepted and the reproduction type-checks without error.