I spawned near a pillager outpost but built out of render distance. I left my computer running over night and came back to there being about 100 pillagers all around my house making it very difficult to do much because it lags my computer. There seems to be a problem with mobs despawning, which also leads to there being about 1400 fish in the ocean which does not help my computer.
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I've seen something similar three times now on Java Edition 1.14.4. These three instances occurred on a multiplayer survival world around pillager outposts. The one I witnessed ended up with around 100 pillagers in the same area around an outpost (not all pillagers are in the screenshot below).
[media]A second documented instance:
[media]
Please check if that's still an issue for you in the latest 1.14 (pre-)release.