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Describe the Bug:
1- Fangren Marauder itself if becomes an artifact and is put in graveyard doesn't prompt to gain life or not and doesn't gain life.(It doesn't make a legacy which if I am not wrong is needed to work like that).
2- Also has the usual bug that doesn't trigger if it dies simultaneously with artifact creatures.

Which card did behave improperly?
Fangren Marauder

Which update are you using? (date, name)Which type? (duel, gauntlet, sealed deck)
Manalink 2016/08/27: Eldritch Moon v2, duel

What exactly should be the correct behavior/interaction?
1- Rulings:
1/6/2011 If Fangren Marauder has itself become an artifact for some reason, you’ll gain 5 life when it is put into a graveyard from the battlefield.
2- Fangren Marauder triggers if it is put to graveyard simultaneously with artifacts and you have the option to accept the trigger for each artifact or not.
Are any other cards possibly affected by this bug?
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It worked for me, but with 2 Fangren Marauder in bf and one affected with Ashnod's Transmogrant.

In your example they don't trigger on their death but on Ashnod's Transmogrant going to graveyard.You can try make one Fangren Marauder artifact the another not and cast Wrath of God for instance neither will trigger.