Villagers don't become unemployed when their workplace is destroyed/when they cant reach it

Villagers don't become unemployed when they can't reach their workplace block or when it's destroyed(watch the video).

Steps to reproduce:

1. Get an unemployed villager

2. Give him a job with any jobsite block

3. Break the jobsite block

Observed result:

The villager still keeps it's job even if you haven't traded with it

Expected result:

The villager loses it's job and becomes unemployed