With the EoF Titan exotic Melas Panoplia when switching to a sword after gaining the Forge Master perk, the perk seems to just disappear.
Unsure if this is a bug or intentional.
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Likely a side effect of this: [quote]Melas Panoplia Fixed an issue where the Forgemaster melee regen was remaining active after switching off Throwing Hammer.[/quote] Post about it in #help and include a clip.