Here you'll find a list of fixes that were made in december. Some of the fixes below take effect the moment they were implemented, while others may require scheduled realm restarts to go into effect. This list will be updated as additional fixes are applied.
Other Data Base fixes (quests, creatures, loot etc) you can look at this section (from 30.11.18).
Changes:
Hotfixes December 29, 2018
General
Fixed 1 reason of the server crash.
December 28, 2018
General
Fixed damage calculation for upgradable heilroom items.
Fixed item level calculation for upgradable heilroom items.
Fixed Bonus Roll animation.
PvE Spectator will now correctly display localized instance difficulties.
Fixed player search system, item search system by name with a random suffix in AH.
In-game calendar:
Added possibility to create guild events, send event notifications to guild members/specific players.
Fixed display of guild events and announcements in the guild calendar.
Added possibility to create personal events and invite other players to this event.
Fixed notifications about events which players can receive in in-game mail.
Fixed event management system, participation, cancellation and other functions.
Fixed notifications about start and end dates of in-game events.
Fixed notifications about Darkmoon Faire in calendar.
Fixed issues which caused guild calendar's UI to sometimes bug out.
Pet's attack speed will now be correctly calculated from owner's attack speed.
Fixes in energy recovery system and concentration for pets.
Fixed movement animation when the player got any disorientation effect and could visually run in some other direction for other players.
Paladin, monk and druid tanks will now receive 40% bonus healing from PvP Power, instead of 70%.
Fixed an exploit which allowed players to receive bonus PvP Power from other specializations.
Priest:
Fixed an issue due to which http://www.wowhead.com/?spell=109142 spell proc if healing done was more than (or equal to) 65% of the maximum health and target's current health was 35%.