TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, non-static method Drupal\taxonomy_entity_index\BatchService::proc essEntityTypeReindex() cannot be called statically in _drush_batch_worker()

Problem/Motivation

Under PHP 8.1:

  TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid   
  callback, non-static method Drupal\taxonomy_entity_index\BatchService::proc  
  essEntityTypeReindex() cannot be called statically in _drush_batch_worker()  
   (line 256 of /var/www/cms/docroot/vendor/drush/drush/includes/batch.inc).

This is a new thing in PHP 8. Surprised it hasn't been fixed already. Maybe I missed something :

Steps to reproduce

Run the rebuild Drush command.

Proposed resolution

Gonna try to just change these to static methods and see if that works. If that doesn't, there are a few valid approaches.

Remaining tasks

Do the thing, see if it works.

User interface changes

None.

API changes

Data model changes