As the video shows, i'm unable to collect any heavy ammo brick while i have a legendary heavy GL equipped, not even with perks such as gravity well, but as soon as a I swap off I'm both immediately able to grab ammo close enough (29 ammo for wolfsbane upon swap) and gravity well works properly once again. This has been happening since Renegades dropped, please look into it.
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This is on the known issue list. [quote]Heavy ammo grenade launchers cannot pick up enhanced ammo bricks.[/quote] [url]https://help.bungie.net/hc/en-us/articles/39007140765204-Destiny-2-Known-Issues-and-Vital-Information[/url]