1v1 Tree Density Change?

Has anyone noticed a difference with tree density with wood lines?
I’ve witnessed a few matches of units creeping through the woodline when opponent builds walls, where palisades meet the sides of the wood line. I saw it on Fitzbro stream as well. Units not running through the sides, but through the center of the wood line.
I experienced a 1v1 match on Altai where my horsemen went right through the tree gaps. Not the sides where walls are placed.
This match: Drumsin's Game – AoE4 World
It doesn’t strike me as overchop on the sides.
or over extending chop
or maybe it’s a lesson to players to wall beyond the tree line