in 1.14.4 if you put a dead brush(i tried only in this block) and break it instanly(many times) the block under will start to break

19w42a and 41a put spiderwebs in the air like the photo and when you are almost on the floor you will instant fall and the spiderweb is not slowing your fall speed

the second bug is putting one bee nest and one beehive you are going to get the block(in creative mode you cant get broken blocks)