[2023] Left leg attachment is invisible

It turns out that this is a cosmetic issue associated with players who manage to get captured by the Grustrag 3 and haven't built their Release yet.  Your warframe has been vandalized by the G3, that's why you have a Grineer emblem and the weird chunk of hardware on the left shoulder.

There is no ETA on a fix. You can immediately (1 minute) fix this yourself by just building the Grustrag Bolt Release in your foundry. Hope that helps.