Thanks for trying it again, I'm assuming it's GPU and game engine related so it should be resolved in the next major engine update when the new rendering is implemented using Vulkan.
If you keep moving the sword won't be pulled each time you attack since the character sheaths the sword when idle.
Godot is great, it's lightweight and completely free and open-source.
There are many tutorial channels on YouTube. I recommend GDQuest and gamefromscratch's tutorials.