This is a bug that has existed in-game for as long as I can remember, but with the addition to Arc 3.0 and the amplified buff, it is now 100% reproducible without any outside assistance, like a launcher, or moving platform.
Steps to Reproduce:
1. Equip the Arc 3.0 Subclass
2. Load into any combat area and become amplified
3. Sprint until you gain the Speed Booster buff
4. Jump while sprinting
5. At the height of your first jump, press the jump button again to perform a double jump. Activate the triple jump after that.
Result: The triple jump gains no upwards height, resulting in the player immediately falling apon activation instead of extending their jump further.
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As far as I know, this has been a bug for years with anything that made you jump high