After open bottom cover a Motherboard part attached to magnet in cover

While doing a SSD swap, I removed the Bottom Cover, when preparting to assembly I notice a part of the motherboard attached to a magnet in the cover

See where the item is missing

You can see in this picture how the part should be (but is actually loose already)

and how the cover has a magnet there (I assume is for cover detection)

After this happened the Laptop is not powering on. Can we repair/re-attached the component? If a new motherboard is required, how can we avoid from happen again? the loose component is almost in direct contact with the magnet once installed the cover