Guild Wars 2

Steps to reproduce:

• use a mortar (the siege weapon)
• press “5” for “concussion barrage”-skill
• aim somewhere to the side so the mortar has to spin sideways
• when the mortar starts turning, press “^” to leave the mortar
• if you now interact with the mortar, “concussion barrage” is on cooldown (~25s)
• if you wait till the cooldown has run out, all skills except “concussion barrage” are gone
• you now have to use “concussion barrage” to make the other skills re-appear

More than a year and still bugged