I always start my beans early in the greenhouse and sometimes planting gets delayed due to weather and they will be a bit to tall and I plant them deeper and have never had a problem. I do grow in raised beds that drain well though. If you are planting them in regular garden soil that is wet you might be better off not planting deeper. You could help support them by using some light dry mulch to help them stay upright until they thicken and toughen up if hardening them off hasn’t done yet.
Bill
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