{$POINTERMATH ON}
      Move((@Buffer+Subindex*ElementSize)^, Temp^, ElementSize);
      Move((@Buffer+Index*ElementSize)^, (@Buffer+Subindex*ElementSize)^, ElementSize);
      Move(Temp^, (@Buffer+Index*ElementSize)^, ElementSize);
      {$POINTERMATH OFF}

I think it's possible to trigger it with

function wrap() {
  return Reflect.construct(HTMLButtonElement, [], new.target);
}
let protoCount = -100;
let x = Proxy.revocable(
  wrap,
  {
    get(...args) {
      console.log('get', args);
      if (args[1] === 'prototype') {
        ++protoCount;
        if (protoCount === 2) {
          x.revoke();
          console.log('revoked');
        }
      }
      return Reflect.get(...args);
    },
  }
);

customElements.define('x-rev', x.proxy, { extends: 'button' });
wrap.prototype = null;
protoCount = 0;
new x.proxy();

Uncaught TypeError: Cannot perform 'undefined' on a proxy that has been revoked