JWST NIRSpec and MIRI spectra of the nearby Type Ibn/Icn supernova 2023xgo at +377 days reveal cool silicate dust masses exceeding 0.03 solar masses at radii matching the forward shock, alongside optically thin carbonaceous dust and persistent narrow He I emission indicating ongoing circumstellar interaction. This single-object study, relying on photometric and spectroscopic data from JWST, WISE, and Gemini, challenges standard dust-yield prescriptions in core-collapse models by demonstrating rapid pre- and post-explosion dust production in He/C-rich environments. Preprint limitations include the absence of peer review and reliance on one event without multi-wavelength baselines for comparison. Earlier work on SN 2006jc (Pastorello et al. 2007, MNRAS) and dust in SN 2010jl (Gall et al. 2014, Nature) documented similar interaction signatures but lacked the mid-IR sensitivity to quantify late-time reservoirs, a gap this observation fills while exposing underestimates in galactic chemical evolution simulations that treat Ibn/Icn events as negligible dust contributors. The blueshifted line profiles and lack of molecular emission further suggest internal dust attenuation not captured in current hydrodynamical codes.