When I was in creative mode, I had Netherite armor in the lower slot and when I pressed the left button on the computer mouse, the armor was put on, but it still remained in the lower slot.
Steps to Reproduce:
1. Сreate a world with creative mode
2. Take Netherite armor and move it to the lower slot
3. Out of recipe book
4. Select a slot with Netherite armor
5. Click the right button of the computer mouse on the Netherite armor
6. As a result, the armor will be on You, but it will also remain in the slot