As seen in the video linked, after using Combination Blow for a while it suddenly stops working properly, and charged melee's no longer give Gambler's Dodge back.
I had previously thought that mods that gave other abilities energy when using my Class Ability was the source of the problem, but I tested without having any mods that would give abilities back and the problem still persisted.
I believe this bug has been around since the launch of Beyond Light, but as I was using Stasis for the past weeks I forgot about it until I recently started using Arc Hunter again.
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Same issue for me - thanks for posting. Super annoying because it basically makes the subclass unusable for high level activities.