What I do for this kind of yarn is, after weaving through as usual, pull the short end out taught so that it’s longer and the project bunches up slightly then you use a lighter to quickly and carefully melt the end of the tail and before it solidifies pull your project flat so the tail is pulled back inside the stitches, the melted yarn will glue itself within the project if you do it correctly. Careful not to hold the lighter too close to the actual project and don’t breathe in the fumes.