illustrating a bug in system.debug()

SystemDotDebugWeirdness.cls

public with sharing class SystemDotDebugWeirdness {
	
    //this is copied from the WeekFiveHomework class--slightly modified to just zoom in on the issue we
    //were looking at in class
	public static void soqlPractice () {

		//Query for accounts
		List < Account > topFiveAccounts = [SELECT ID, Name, AnnualRevenue FROM Account WHERE AnnualRevenue !=0];

		system.debug('This should be 5: '+topFiveAccounts.size());

        //Query for Opportunity--and the related Account's name
		List<Opportunity> myOpps = new List<Opportunity>([SELECT Id, Opportunity.Account.Name, StageName FROM Opportunity WHERE AccountId IN :topFiveAccounts]);
        //Weird--the account name isn't showing up here...
        system.debug(myOpps);
        for(Opportunity o: myOpps){
            //BUT IT IS SHOWING UP HERE!
            system.debug(o.Account.Name);
        }
		//SO--we're finding that system.debug has some limits...
		//...sad trombone sounds...
	}

}