Variables set under the Variables: field and with - setvariable{save=true} are not retained upon Restart. #5225

Title. Tested on 1.20.4 Paper & MythicMobs Build #5127.

Used this mob:

test-variable_saving:
  Type: ARMOR_STAND
  DisplayName: Variable Saving Test
  Options:
    Despawn: persistent
  Variables:
    test1: false
    test2: "true"
    test3: 777
  Skills:
#  - skill{s=[
#    - setvar{var=caster.test1;val=<caster.var.test1>;type=STRING;save=true}
#    - setvar{var=caster.test2;val=<caster.var.test2>;type=STRING;save=true}
#    - setvar{var=caster.test3;val=<caster.var.test3>;type=INTEGER;save=true}
#    ]}  @self ~onSpawn
  - message{m="<caster.var.test1> <caster.var.test2> <caster.var.test3>"} @trigger ~onInteract

Expected behavior - After Restart, right clicking the mob returns false true 777 in chat

Actual behavior - After Restart, right clicking the mob returns UNDEFINED.

With

#  - skill{s=[
#    - setvar{var=caster.test1;val=<caster.var.test1>;type=STRING;save=true}
#    - setvar{var=caster.test2;val=<caster.var.test2>;type=STRING;save=true}
#    - setvar{var=caster.test3;val=<caster.var.test3>;type=INTEGER;save=true}
#    ]}  @self ~onSpawn

Uncommented, results are the same.

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