The librarian displays a functioning clock and compass.That way, players can see what time is it or in which direction the spawn is without having any emerald.

Steps to reproduce [EVGENSYPERPRO]:

1. Summon villager.
2. Give him a profession that has trades with a compass and clock.
3. Look for trades that have a compass or clock.

Observed results:
Librarian trading output has functional clocks and compasses.

Expected results:
Librarian trading output will not has functional clocks or compasses.

Screenshots: