A very direct, relatively reliable indicator we could look at to see if this has happened at all anywhere recently is the gold premium in China, which has gold import restrictions. Just days ago people were willing to pay ~$100/oz over the international mark price, so there are people willing to spend >5% above the mark on a high volume asset in order to have a physical hedge in the event of a catastrophic failure of the yuan.

https://www.bloomberg.com/news/articles/2023-09-27/chinese-g...