Hi,
I was playing my SP world and then i throw one egg. Then I was really suprised when bunch of chickens (4) came out.
I search there for same bug and i found one already solved for version 1.14.3 and its still in game. Hope this report will be handy and helpfull. Cannot post video there, its larger than 100 MB, so u can find it on YouTube
How to reproduce:
Just throw chicken eggs. You will get it soon
Video:
It is a really rare occurrence. This is intentional