Ever since I updated to 1.14.3, I have had two zombie sieges spawn within my village in the span of a few days. However, my village does not meet any of the requirements for a siege to spawn:

"Sieges only occur in villages with at least 10 beds and 20 villagers"

As seen in the image, I only have one villager in my settlement and two beds in total - one for me (not in the picture), and one bed for the villager.