I previously did the math here and concluded There haven't been 71 million shares moved from unrestricted to restricted, OR there have but more restricted have simultaneously been issued.
I overlooked that indeed 50,000,000 new restricted were issued on 3/31 for Valentin Dimitrov's Series E conversions. (Page 7) So the math could be:
451,289,565 restricted reported December 31, 2021 - 71,000,000 for Savov settlement + 50,000,000 for Valentin Dimitrov - 29,926,380 for other parties (or some of Dimitrov's became unrestricted since 3/31) = 400,363,185 restricted reported as of 5/30