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Call of Duty: Modern Warfare (2019) was a hindsight kind of development for Infinity Ward. If I remember correctly, they had only designed the game, but with no real DLC roadmap. So much so, the assets had to be rebuilt using patches. So, the first DLC had to use files OUTSIDE the bounds of the engine. That's why there's 2 or 3 Multiplayer packs.
Modern Warfare 2019 was finished when it shipped. The only issue is that there were stupid design decisions, like no red dots on mini-map. There were some outstanding glitches left over from the final stages of development. Those glitches were like 100 glitches left to finish.
But it was complete. There was ZERO ideas on how to approach the new DLC's. So, the whole game needed to be patched OVER. In other words, the reason why each DLC pack was in 100gb realms is to overwrite the code to understand "this means this," and "this model is designed for this" etc. I remember the first Multiplayer pack glitching out so much they had to fix it on the fly.
How to solve it? Download ALL Multiplayer packs. The patches will download as you launch MW2019, and updates will go through once you've gone to lobby.
This design was fixed in MWII, and MWIII.
Just know you are better off than us when we played it on original PS4/Xbox One hardware. We got pissed off at Activision for this whole mess. Downloading 100gb on SATA drives? We waited HOURS.
I imagine PS5 being able to download and install better. I have PS5.