After setting Roughness and Normal to Color Space: Non-Color, the problem persists.
Yes that is like stretching. Might be that edge thin line has got no width in the UV, due to some error in seams possibly.
Try selecting thar face and seeing it on the UV, that may give some clues to the cause.
This edge is not selectable in Edit Mode as there is the Solidity modifier.
if you have a solidify modifier active, it projects the UVs to the other side, and the sides stretch like that. There is a way of modifying the UVs in geometry nodes, but that’s a little bit of a hassle.
I’d suggest just fixing the UV’s after you apply the modifier.
Then there is no UV-Map data available for this visual part.
You can use cube projection (I think).
Or apply the solidify modifier and work with UV-Maps.
But to be honest, in the end versions, you will not notice this tiny detail.