Please help with editing costume (in-game issues)

[RenaPG]

Hello. I'm attempting to edit some of the DLC costumes in the game as practice, and I used this tutorial to delete some parts of the costume:

 

After deleting the vertexes I wanted on TMC Polygon tool (as described in the tutorial), it looks as it should when I open the model on LR Photo Studio:

 

 

But in-game it looks like this (loaded with AutoLink):

 

 

The body and a bunch of the parts of the costume are invisible. Anyone know why this is happening and how I can fix this?

 

 

EDIT: Ok, after trying an older version of TMC Polygon Tool (0.19.1) the problem no longer happens and the model looks as it should in-game after deleting the vertexes. So I can only conclude this is a bug with the latest version of the software (0.20.3).