https://apex.oracle.com/pls/apex/f?p=134181:13
The Edit icon on each row is the out-of-the-box IR Link To Custom Target. Link Attributes is set to title="Edit #COL1# row" data-xyz="#COL1#" where COL1 is a column in the report.
Looks like the #COL1# substitution is not done for hidden columns! I could have sworn this worked in earlier versions.
Am I missing something? Isn't the whole point of using Hidden IR columns exactly situations like this?
Thanks