The TOS ships (especially the Pioneer) have a ton of zfighting issues when in sector space. Basically, all of the decals, a load of the windows, even the spinning bussards do it to a certain extent. The biggest culprits though, are the red line decals on the nacelles and the secondary hull.
This is something that has been going on ever since the sector space revamp a few months back.
I need a beer.
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