Bungie, here's a thought for you.
Whilst you acknowledge there is an unresolved issue with losing heavy ammo, you have still not provided a workaround.
There is a simple solution.
Ensure that Xur stocks it on every rotation and/or reduce cost of heavy synth at gunsmith/Eris.
It's simple customer support. If there is an ongoing issue that you are still trying to resolve, provide the customer with a workaround until the issue is resolved.
-
I normally would say to just let it be, but until they fix the heavy ammo glitch, I agree.