Minecraft | Set and remove NPC skin from tab?

Br
- in Skins
2

In advance: I know about Packets quasi 0.

Nevertheless, I wanted to program an NPC for my server. I followed the videos from GERVobis and everything worked so far. With him the NPCs had a skin, with me too. Unfortunately, they were always visible in the tab. So I used the rmvFromTab method. Unfortunately, they lose their skin.

How do I get them out of the tab and keep the skin?

If I set the skin again afterwards, you can see it again in the tab.

(Tab = tabliste, MC version: 1.8.9)

Here is the NPC class:
Here is the reflection class:

Sh

Just take Citizens

Br

No, I will not. I've already adapted everything to the NPCs.