Every thing you mentioned are the surface problem,not the root problem. Just like in 1929 America,on the surface it's stock market crash and over production problem. But the deep underlaying problem is still wealth concentration.
The US has experienced high economic growth prior to 1929,the so called "Roaring Twenties". But during that period new wealth didn't evenly distribute,a small group of people owned most of that wealth,average worker didn't get much pay rise. So over time the consumption power of the public stagnant, thus future problem already seeded long before 1929. The stock market crash is just a trigger for the root problem,which cannot hide forever
China unlike the US has been trying to address wealth inequality through common prosperity. Just as all major banks and financial institutions have increased the salary of low ranking employees and cut salary for upper management and executives to narrow the wealth gap.
However, the issue for China now isn't wealth concentration even though wealth inequality would be a long term problem for China. China is suffering from the collapse of housing market. As too many people have put their saving in buying their homes, when house price decrease people start to feel much poorer due to wealth destruction. When home price increases, people feel more confident due to wealth effect.
For China, it is a painful but necessary process due to the fact that any further increase in housing price would cause a bigger bubble. Due to the trade war and pandemic, China has postponed in cracking down on housing market which is the reason why the housing downturn is so much more problematic.