The file that has the Undelete command is fmt.php, only one line was added.
The other files had little visual changes, I think it will not cause problems in your ABCD if you keep the most updated versions
What I do not understand is why it is not working now. I reviewed the PR https://github.com/ABCD-DEVCOM/ABCD2/pull/465 and could not find the reason for the error.
I need more information.