Pillager Captain not spawning at outpost

After making a raid farm at a local outpost, I noticed that pillager captains seemed to have stopped spawning. Normal pillagers still spawn just fine, but not the captains. I looked around to make sure there was no hidden pillagers in the area (I heard that hidden pillagers could cause this), but I found none.

Here are the few things I know:

• I am playing on a realm (I own it)
• The world was made Oct 12 2019
• Pillager Captains did spawn at the outpost at one point.
• I have seen other older posts that say that they have resolved the issue