Fatal error on Drupal 11 if an exposed views filter has option "reduce"

Problem/Motivation

"workflow_state" views filter causes fatal error if enable option «Limit list to selected items».
TypeError: array_keys(): Argument #1 ($array) must be of type array, null given in array_keys() (line 276 of core/modules/views/src/Plugin/views/filter/InOperator.php).

Steps to reproduce

1. Install Drupal 11 (I tested on 11.1.6 )
2. Install and configure Workflow module (I used 2.0.0)
3. Add a workflow field for any content type (e.g. Article).
4. Create page views on this content type.
5. Add exposed filter for the created workflow field.
6. Check option «Limit list to selected items» for the created filter.
7. Open the views page and see the error.

Proposed resolution

Remaining tasks

No

User interface changes

No

API changes

No

Data model changes

No