FWIW, I was unfortunate enough to go through 20w21a which effectively emptied my ocean monuments (a direct 20w20b backup to 20w22a transition worked OK). So I had a look at my regions and noticed that for certain duplicate references with both lower and upper case versions the former didn't have the data of the latter (as already mentioned). So I located all mismatches (79) and copied the data manually. After that I upgraded this 20w21a world to 20w22a which resolved the issue for me, more guardians than you can shake a stick at.
The only side effect is that one elder guardian relocated to a different underwater structure in my neighbourhood. I guess I can live with that 🙂
Marko Lukat
FWIW, I was unfortunate enough to go through 20w21a which effectively emptied my ocean monuments (a direct 20w20b backup to 20w22a transition worked OK). So I had a look at my regions and noticed that for certain duplicate references with both lower and upper case versions the former didn't have the data of the latter (as already mentioned). So I located all mismatches (79) and copied the data manually. After that I upgraded this 20w21a world to 20w22a which resolved the issue for me, more guardians than you can shake a stick at.
The only side effect is that one elder guardian relocated to a different underwater structure in my neighbourhood. I guess I can live with that 🙂