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Hm. Is it context.newRecord.id? Or am I misunderstanding the question?

that doesn't seem to work, which is odd considering I've used this exact same pattern in other scripts before. for context, here's how I've applied it:

function beforeLoadFunc(context) {

 var idcheck = context.newRecord.id;
 var rec = record.load({
   type:"customrecord_test",
   id: idcheck
 });
 var recfield = rec.getValue({
   fieldId:"custrecord_testbool"
 });

 if(context.type == context.UserEventType.VIEW
      && recfield == true) {
     //button is displayed
 } else {
     //button doesn't show
 }
}

I know I can't use currentRecord as that's a ClientScript-only module. Maybe I'm missing something?

Something weird is going on…..

context.newRecord.id

should work in beforeLoad