Came across this article which in part says this.

 " Factors that have been linked to delayed maturity or green stem disorder include:

Stink bug feeding

Late herbicide application

Fungicide application

Infection by one of several soybean viruses

Late planting and/or emergence

Mixed seed lots (seed lots of blended cultivars)

Sometimes leaves or petioles may remain attached to plants with GSD symptoms. Green plants also may have significantly fewer pods. Only normal maturation of stem tissue appears to be affected. Plants affected with the disorder may be scattered or occur in patches or even large areas in the field."

Green Stem Disorder - Soybean Disease - Soybean Research & Information Network - SRIN (soybeanresearchinfo.com)