bug(chip): chip selection state does not match [selected] v19.1.1

[Siddhu-K]

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

19.1.0

Description

I have a component with selectable stacked chips with drag drop to rearrange/toggle columns of my table.

after 19.1.1 update moving deselected chip changes the selection of other chips not respecting the [selected] in mat-chip-option

Reproduction

I have create a minimal reproduction of the issue

https://github.com/Siddhu-K/chip-drag

toggle chips and drag drop.

<mat-chip-listbox
  multiple
  cdkDropList
  cdkDropListOrientation="vertical"
  class="mat-mdc-chip-set-stacked"
  (cdkDropListDropped)="drop($event)"
>
  @for (i of chip_list(); track i; let index = $index) {
  <mat-chip-option
    cdkDrag
    [cdkDragStartDelay]="{ touch: 200, mouse: 0 }"
    [selected]="i.selected"
    (selectionChange)="chipSelection($event, index)"
  >
    {{ index + 1 + ". " + i.name + " - " + i.selected }}
  </mat-chip-option>
  }
</mat-chip-listbox>

Expected Behavior

actual selection should match [selected] in the mat-chip-option

Actual Behavior

actual selection does not match [selected] in the mat-chip-option

Environment

Angular CLI: 19.1.8
Node: 22.13.0
Package Manager: npm 11.1.0
OS: win32 x64

Angular: 19.1.7
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package Version

@angular-devkit/architect 0.1901.8
@angular-devkit/build-angular 19.1.8
@angular-devkit/core 19.1.8
@angular-devkit/schematics 19.1.8
@angular/cdk 19.1.5
@angular/cli 19.1.8
@angular/material 19.1.5
@schematics/angular 19.1.8
rxjs 7.8.1
typescript 5.7.3
zone.js 0.15.0

[Siddhu-K]

Expected behaviour v19.1.0

Incorrect behaviour v19.1.1

[Siddhu-K]

The issue had nothing to do with drag drop. Just changing order of the chips recreates the issue. I have updated the repo to illustrate the issue.

i think the issue was caused by #30347

[wagnermaciel]

@Siddhu-K Would you be able to provide a stackblitz implementation? I cannot download & run your example repo because of potential security concerns

[Siddhu-K]

@wagnermaciel Heres the stackblitz. https://stackblitz.com/~/github.com/Siddhu-K/chip-drag