What economies have switched to yuan? They don't have open capital markets, so that would be quite stupid. Many failing economies have in turn switched to usd (dollarization). Zimbabwe, Venezuela for example. Argentina is de facto dollarized.
Discussion
For example, countries that have limited access to the dollar (Russia) or that trade with China (Saudi Arabia). Czech National Bank also buys yuan after all. In addition, some believe that the Chinese yuan may account for up to a 1/5 of global foreign exchange reserves by 2030 🙈
Czech national bank has marginal position in Yuan, this image is from their 2022 report. Even Australian dollar is twice as high.
https://www.cnb.cz/export/sites/cnb/cs/o_cnb/.galleries/hospodareni/download/ruz_2022_cz.pdf
https://nostrcheck.me/media/public/nostrcheck.me_7551881190626808761687204319.webp