Texture & Behavior pack does not load on starwars mashup on a Realms for friends

Hello,

On my Realms server I have the following problem :

When loading on the Realms the Star Wars Mashup (Texture & Behavior pack are activated), my friends who are connecting are being asked to download the pack (as they don't have it), but it's does not get activated.

When creating an empty world, and activating the packs, it works...

So the problems is only when the Mashup World + packs are on the realms.

I don't have the problem on my computer where I bought the packs.