After all the issues with getting the infernal forge weapons to show up, I went through a lot of transmutes from various sources and checked them and found one other problem weapon transmute. The symptoms are the same as for the Infernal Forge weapon, that is, the weapon just shows up as a "fuzzy" blue square, so my guess is that it's the same underlying issue.
The weapon in question is the
Prized Blessed Symbol of the Cult
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Edit: I just checked myself and I'm seeing the correct graphics on my character - is this happening consistently with this weapon for you @adinosii?
Note, however, that I have only tested the Prized Blessed Symbol of the Cult, that is, the Cleric weapon. I have no idea if the same issue exists for the corresponding weapon for other classes.
Perhaps the blue square shows up for you snd not for me due to differences in our graphics cards or even just settings.