whoa, what where they thinking?
We have a 2019 25BHS with no lip (attractive lines in yours tho) Our water puddles from a fabric curtain not falling straight into the tub, but resting on the side, because of the pivot rod I installed to allow more room in the shower, easily corrected by using a vinyl liner
You have a new 2021, why should you be expected to correct anything?
Especially water damaging puddles?
There's no way water is going to flow back into the tub. Not with the lipped pathway outside the tub area.
I'd suspect the dealer has already been in contact with Gulf Stream. What has been their response?