It’s intended .
Also sure you can learn spells with lvl 1 wizard and 11 cleric but your spells will still scale with Wisdom and the wizzard spells will scale with INT meaning you won’t have many spell slots and your offensive spells will be gimped with crap hit chance as you will have Low intelligence.
In fact this is the sole reason why wizzard spells are the only ones that are INT based while all other casters are Charisma or Wisdom based . You can add 1 lvl of wizzard but your spell slots are purely dependent on INT and so is your hit chance with them
