A Subject Matter Expert corrected me on
“learnt” (screenshot below) and I
have updated the instruction to “learned” ;-)
Coming from Commonwealth country, we use “learnt” for past tense and past participle for learn. Here's an explanation from AskOxford on this matter:
What is the difference between 'learnt' and 'learned'?
Learnt is more common in British English, and learned in American English.
There are a number of verbs of this type (burn, dream, kneel, lean, leap, spell, spill, spoil etc.).
They are all irregular verbs, and this is a part of their irregularity.
Consider this: Hey! You've misspelled 'missplelt'.
However, in the context of "learned judge" it is still the same spelling regardless where you are.