TYPO3 Core

When using backend layouts and setting display of "Columns" (colPos) field of the tt_content table in the List module, the old standard column titles (Left, Normal, Right, Border) are shown (or nothing is shown at all when colPos > 3) instead of the backend layout column titles.

"Major" issue as It completly misleads BE users on what columns the tt_content elements are assigned and thus makes it unusable in production environment.
(issue imported from #M17742)