Driving through Savannah today, in part to try to finish off GA 204, I noticed that what is probably a route marker on the BGS for I-16 exit 165 (where GA 204 merges into WB I-16, per the HB) was greened out. I followed the HB routing for GA 204 from there, but didn't see any GA 204 markers until the intersection with GA 21. Might GA 204 have been truncated at GA 21? GA 21 would be a logical new endpoint, since that route connects to I-516.
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I picked up at a visitor center an official state road map, which has an inset for Savannah showing GA 204 ending at I-16. However, they were still giving out the 2019-2020 edition. I don't know if a more recent version is available, or coming out soon.