If people know how items work, they know that:
There's Textures
And
There's a config file that lists the markings for the game.
When you install marking mods, item mods or any other mod that uses a config file to list what can be used, is that the ORDER of the list, and the AMOUNT that is listed must be edited and added correctly.
IF you install old mods for the old game, it will ignore the new proper listing for the game and make it so the majority of the markings will not be listed properly = your game will not be the same as the original.
This will make it so regular players markings will not be displayed properly to you. You might "think" they are as you see people with markings, but many markings might be off as the other players is actually wearing something else. Not exactly rocket science.
You should not install markings, items or emote packs until you know for certain the specific mod supports this new update, even if your characters "Must" have Mass markings or something to look as they should.
I hope I explained this well enough as we've already warned users.