I was fine with the chase, i get it, because i use the same situation in my 5E games, and it went similarly the first time i used a chase scene, it was very foreign to my players who play in grid format with miniatures.
there is the argument that the creatures reduced speed allowed us to catch up, there is also the argument for Plant Growth 'becoming thick and overgrown' causing visibility issues ( i did not point this out before because it comes down to DM ruling, but had it been me i would have said visibility was heavily obscured at +50', and partially obscured at 20' ), the party were able to move through the Plant Growth, but it still obstructs their visibility ( the pants move around them allowing the normal speed). And the fact that chase scenes assume some juke and jive going on (DC contest) allowing the chased to elude the pursuer, this concept took my grid and miniature gang a few attempts to accept. I played it out in melee format the first time, because our monk was crying foul ('no way it can evade me with my step of wind!'). and he failed a Dice contest, the prey elude him as he overshot /took a wrong turn/had to double back...etc etc.