TYPO3 Core

The $dataHandler->substNEWwithIDs array is empty and i don't know why. No previous errors get logged.

Tbh i have no idea how to reproduce it besides that it happened on inserting a page after copying (sometimes).

But i found this issue: https://forge.typo3.org/issues/98959

I think that might be just the same problem.

Philipp, did this problem occur on a site where you had modified the pages TCA, or was it a clean core configuration?

I have tested it on my local env, using T3-dev and couldn't reporoduce the issue when copy/pasting pages.

Looking at the code, there are 3 places where this temporary ID to real ID could fail:
- DataHandler::insertDB() where we call $id = $this->postProcessDatabaseInsert($connection, $table, $suggestedUid); but here we always has some int value
- DataHandler::insertDB() wher we check if (!$dontSetNewIdIndex) { $this->substNEWwithIDs[$NEW_id] = $id; ... } ; but looking at the code, this condition is never met, maybe if you overwrite core functions or call this the DataHandler::insertDB() from custom code with this parameter set to true
- some wrong mapping of the temporary ID used deeper in T3 and in higher code parts, but i as i said, i cpuldn't reproduce it.