I got mine secondhand from someone who had it on their launch edition. From day one it’s had some water pooling after heavy rain but I’ve never had an issue where it leaked into the bed, even when rolling it up it always just pours out the sides over the edge of the bed.
I think of it is just part of how it’s designed since it’s soft with very little internal support.
Overall I think it’s the best Tano cover of all of them so it’s one of those small things I’ve just learned to live with and ignore. Ive had mine for close to two years now and the pooling hasn’t noticeably increased.
Also as a note the snow does sit on top of it but I’ve never noticed it stretch the fabric. If I am removing the snow from the cover I just make sure to use the bristle side of my Snowbrush.