Librarian villager trading issue

Villager Librarian Trade Changed After Logging Out Without Trading – Hardcore Mode

Game Version: Minecraft Java Edition 1.21 (Hardcore)

A librarian offered Unbreaking III shortly after being assigned to a lectern in a Plains biome at Y=91. I did not lock the trade (no book was purchased). After logging out for approximately 3 hours and returning to the world, the trade had changed to Lure III without any interaction or workstation changes.

Steps to Reproduce:

1. Place a lectern near an unemployed villager.

2. Wait for the librarian profession to appear.

3. Check for a valuable enchantment trade (e.g., Unbreaking III).

4. Do not trade to lock it.

5. Save and exit the game.

6. Wait a few hours (possibly simulate with time skip or changing system time).

7. Reopen the world and check the librarian’s trade.

Expected Result:

Trade should remain the same unless the workstation is changed or the villager loses their profession.

Actual Result:

Trade changed from Unbreaking III to Lure III without any player interaction.

Notes:

1.Playing in Hardcore Mode

2.Plains biome

3.Elevated terrain at Y level 91

4.No mobs or workstation changes occurred during log-out

4.No mods or data packs used

Kindly go into this issue and resolve.I am really frustrated with this.That it happend in hardcore.

Unfortunately I don't have any evidence but the bug is real.