There has been a lot of talk since the Ukraine - Russia war started that the rising prices in the agricultural sector will cause a new Bear Cycle in the stock market. Commodities have been rising across the globe as a result of an inflation build up in recent years, accelerated by the COVID pandemic, but with agriculturals in particular, the story is a little different.
This chart illustrates Corn (blue trend-line), Sugar (orange), Soybeans (teal), Oats (black) and in the pane below them is the S&P500 index (green trend-line). As you see, even though price rallies on the agriculturals have caused minor (from a long-term perspective) pull-backs on S&P (as they did in February/ March), they only coincided with a Bear Cycle in the 2007/08 Bear Cycle, which of course was caused by the subprime mortgages.
So the conclusion we can draw is that global indices' reaction in February/ March with a strong pull-back, was very natural based on the long-term historic action. A Bear Cycle has to have a strongest macro-economic catalyst, strong enough to affect the fundamental structures of the capitalistic/ monetary system that supports the stock markets.