In self-created high-resolution Tp´s (512x512), large pixel errors occur in the item. (See attachment.)

What I expected to happen was...:
Usually the texture at the edge is clean and without defects if  you use a Tp with a  higher resolution.

What actually happened was...:
If I use a downloaded Tp (also 512x512 resolution), there are hardly any problems, if at all, and if I use my own, then these large texture errors arise in the item that you hold in your  hand (see appendix) or what is on it lying on the ground.

Steps to Reproduce:
1. Pixels an item with a 512x512 resolution
2. Put the finished item in a Tp
3. Open Minecraft and use it