bug(drag-drop): cdkDropListSortPredicate doesn't work if dragging item enter from top

[yuwu9145]

Is this a regression?

• Yes, this behavior used to work in the previous version

The previous version in which this bug was not present was

No response

Description

cdkDropListSortPredicate doesn't work in certain senarios

Reproduction

StackBlitz link: https://stackblitz.com/edit/z6ffpx7e-wg8uidxw?file=src%2Fexample%2Fcdk-drag-drop-connected-sorting-group-example.html
Steps to reproduce:

1. Open StackBlitz reproduction link
2. The code has cdkDropListSortPredicate applied to "Done" dropzone, the intention is preventing item being dragged to the first index
3. Drag item from "To do" zone and enter "Done" zone from top

Expected Behavior

Item cannot be dragged & dropped to the first index in "Done"

Actual Behavior

Item can be dragged & dropped to the first index in "Done"

Environment

• Angular: 19.0.0
• CDK/Material: 19.0.0
• Browser(s): Chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Windows

[yuwu9145]

No one looks at this issue?

[spockoyno]

Weirdly, when I try the app in the stackblitz, it alternates with letting and not letting me drop the item into the receiver's top position. I drag from the top via seemingly identical routes.