Affects Version/s: 19w35a
Fix Version/s: None
Environment:Windows 10, 1903, JRE 8u51, Official Launcher, Game version 19w35a
The redstone machine looks like this (you may also see the following image):
A=air, B=any solid block, D=dispenser, L=redstone light, N=bee nest, O=observer, R=redstone dust
And the effect looks like another image.
After a bee put honey in a nest, causing a block state update, the machine starts squirting honey bottles and the nests' states switch between honey_level 0 and 5.
I also did another experiment and that indicates that when a nest(in any honey_level) is in front of a dispenser consists of empty bottles, the dispenser will "collect" honey from nest and also may shoot it out.