*What I expected to happen was... *

Employed villager becomes unemployed after job site block is destroyed., particles appears indicating that the villager lost the job. 

What actually happened was

Already employed villager that appears naturally in generated villages retained their job even after their job site block was destroyed, ie villagers became clingy to their jobs., no particles were formed.(Clingy people like these villagers often suffer, these villagers often suffocate, drown, fall from great heights and get attacked)

Steps to reproduce:

1) Find a naturally generated village. 

2) Find an employed villager.

3) Destroy the villager's job site block.