This bug occurred on Playstation 4 for me but can be present on all platforms.
While cloaked, and going trough heat vision mode and normal mode as you do it, scrolling with the weapons toggle trough the weapons generates a cloak related issue, rendering the character/hunter visible.
Once you start using the weapons toggle, especially ones you can equip while on the ground and in the trees, (example, Spear and Disk can be equipped while in trees and ground level, for ground level I used as example, the katana and spear on the Samurai Hunter/Predator) even if cloaked, parts of the Hunter character model start to be seen/visible.
This is important and urgent as it might become visible for other players in the online session rendering cloak not working as intended.
Example videos: