I have the following Apex Trigger that is updating two fields on a custom object when saved.   The Case_Resource_ID__c field is being updated perfectly fine, but the Resource_Name__c field is not populating.  Here's the trigger:

trigger UpdateTimeSlip on Time_Slip__c (before insert, before update){
    Map<Id,Id> caseResourceMap = new Map<Id,Id>();
    String userId = userInfo.getUserId();
    String userName = userInfo.getName();
    Set<Id> caseIds = new Set<Id>();
   
    for(Time_Slip__c ts : trigger.new){
        caseIds.add(ts.Case__c);
    }
    for(Case_Resource__c caseResource : [select id,Case__c from Case_Resource__c where Resource_Name__c =: userId and Case__c IN: caseIds ]){
        caseResourceMap.put(caseResource.Case__c,caseResource.Id);  
    }
      
    List<Contact> contactList = [select id,Name from Contact where Name =: userId];

    for(Time_Slip__c ts : trigger.new){
        if(ts.Resource_Name__c != null){
            if(contactList[0].Id != null){
                ts.Resource_Name__c = contactList[0].Id;
            }
        }
        if(ts.Case_Resource_ID__c == null){
            if(caseResourceMap.containsKey(ts.Case__c) && caseResourceMap.get(ts.Case__c) !=null){
                ts.Case_Resource_ID__c = caseResourceMap.get(ts.Case__c);
            }
        }
    }
}