Follow up from https://github.com/facebook/react/pull/11616.

Here's one I found. These two invariants:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L330-L343

are in a function that's behind a DEV block:

https://github.com/facebook/react/blob/7e7127387ba64f57299eaff8656542cea6fb3a2d/packages/react-reconciler/src/ReactFiberClassComponent.js#L447-L449

I don't think this is intentional, but need to verify.

There may be more. I'll use this issue to track while https://github.com/facebook/react/pull/11616 preserves existing behavior.
validateARIAProperties(type, props);
    validateInputProperties(type, props);
    validateUnknownProperties(type, props);
  };
  var describeStackFrame = function(element): string {
    var source = element._source;
    var type = element.type;
    var name = getComponentName(type);
    var ownerName = null;
    return describeComponentFrame(name, source, ownerName);
  };
  var currentDebugStack = null;
  var currentDebugElementStack = null;
  var setCurrentDebugStack = function(stack: Array<Frame>) {
    var frame: Frame = stack[stack.length - 1];
    currentDebugElementStack = ((frame: any): FrameDev).debugElementStack;
    
    currentDebugElementStack.length = 0;
    currentDebugStack = stack;
    ReactDebugCurrentFrame.getCurrentStack = getStackAddendum;
  };
  var pushElementToDebugStack = function(element: ReactElement) {
    if (currentDebugElementStack !== null) {
      currentDebugElementStack.push(element);
    }
  };
  var resetCurrentDebugStack = function() {
    currentDebugElementStack = null;
    currentDebugStack = null;
    ReactDebugCurrentFrame.getCurrentStack = null;