Custom Record.php blocking Escalate button after upgrade

Hi all.

We have recently upgraded lots of customers from V13 > V14. However it's recently been noted that the "Escalate" button is missing from the dropdown. 

I think I've narrowed this down to being because we have a custom record.php from studio here - custom/modules/Cases/clients/base/views/record.

I can "manually" add the button to the record.php, but this doesn't seem right. Am I missing something here as I'd expect the upgrade to automatically add any buttons to custom record.php files.

Thanks,

Daniel