Was working on draining monument and building a guardian farm when aquatic part 1 came out. Finished it up and it didn't work.
Made creative copy of world to mess with. Nothing worked.
Did /find monument while above farm.
Farm -1712, 64, 171
/find monument -2264, y?, -424
Fly over, new monument in aquatic chunks
Comments

Seed. 1483915426
Bedrock world

So after several hours of messing with this it turns out I'm a newb. If u /locate on top of a monument it will show the next closest. If I /locate st spawn it shows the farms location. Just another case of the wonkie bedrock mob spawning. Plus side learned /fill command tho
Could you provide the seed that you used? Was the world converted from Xbox legacy to Bedrock?