Okay, I've tested this build.
It fixes the seams (which is good), but makes another problem much more apparent. The reflection is now so small on small ship details (cockpits/etc) that all you get is a few flickery specks, making everything look incredibly bad or not env mapped at all.
It seems the env maps got 'squashed together' horizontally.
With this build it is hard to get a reflection at all on fighters, and if you get one it's about 1/8 of its previous size. The capships still work, but even there it's apparent the reflection has been reduced tremendously in size.
In other words, fixes one bug but makes another bug worse (a lot).
Hopefully this can be fixed, as the seams were/are really a nasty issue, too.