Dolgachev-Weisfeiler conjecture over affine space

Let $X\to \mathbb{A}^m$ be an $\mathbb{A}^n$-fibration, meaning that every fibre is isomorphic to $\mathbb{A}^n$. Dolgachev-Weisfeiler conjecture. The fibration is isomorphic to the trivial fibration

$$\mathbb{A}^m\times \mathbb{A}^n\to \mathbb{A}^m.$$

This is the affine-space reformulation of the Dolgachev-Weisfeiler conjecture, using that affine-space vector bundles are trivial. Its status is not specified for this formulation in the supplied candidate metadata.