Delete profile and saved game data at the bottom. Hard reboot the console. Go back into manage game and add ons screen right side of screen select all down to save. Let those install. Hard reboot the console again. Then go back into manage game and add ons and see if any new DLC have populated the list.
Click the Steam tab at the top, then select settings from the drop-down. Inside the settings menu, click the downloads tab and select the “ Steam library folders ” button. At this stage, you should see your folder used for game files. Right-click the folder and select “ Repair Library Folder ” from the options. Idk about ps4 but this is the ps5 work around it might work for ps4 as well. I went to the playstation home screen and go to call of duty warzone> hit options> manage game content> download from there( all modern warfare multiplayer packs and multiplayer/spec ops packs. This worked for me. Bug. After the update, at least for me, MW 2019 is just broken and unplayable. This are the bugs and glitches that I encountered: Glitched menu disappearing; sounds skipping; first person view without weapon; loadout selection menu opening randomly in-game; game freezing when before the update was fine; Server latency all over the place going Xsa3exO.