Male midlander Hyuran missing texture in upper body when set to 'slim'

Hello! :)

Date & Time: always
Frequency: always
World name: everyhwhere
Character name: every male midlander Hyur who is set to 'slim'

Steps:
1. Create a male midlander Hyuran
2. Set body to slim (0%)
3. Use lightest skin


This problem is not tied to a specific pc setup or plattform.

I show some pictures to make the problem visible.

https://i.imgur.com/DDKT4i4.jpeg
https://i.imgur.com/y879G7u.jpeg

Please fix that for male midlander Hyur the muscleslider is tied to the general definition of the upper body and the belly-button.

Thanks for reading! : D