• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have read the FAQ and my problem is not listed.

Repro

// ESLint says: 'num' is never reassigned. Use 'const' instead.
let num = data?.a
num! = 1
// same thing happens with +=, -=, etc

{
  "rules": {
    "prefer-const": "error"
  }
}

// your repro code case
let xp = data?.xp;
/* bunch of unrelated code ... */
xp! = 123;

Expected Result

Nothing, since num is being reassigned

Actual Result

ESLint says 'xp' is never reassigned. Use 'const' instead.

Additional Info

Versions