Despite not losing any Space Wrangers during any of the stages in Chapter 6 - Race to the Bitches, the results screen always shows that a lot of Wranglers were lost (see attached screenshot for example). The number seems to vary; in the screenshot it states 71 were lost, but upon replaying it twice (and not losing any Wranglers either time) I saw numbers as high as 90. It seems random in that regard.

Screenshot example:

BoneCraft - Chapter 6 Results Screen.JPG