This bug was introduced with WordPress v5.5 i.e. this issue in not apparent in WordPress v5.4.2.
On the Users page, when the bottom ‘Bulk Actions’ feature is used to delete selected users, the feature fails … the top ‘Bulk Actions’ feature works fine.
How To Re-Create
Please review this video screencast for a detailed step-by-step guide to recreating this issue: https://1drv.ms/v/s!AiwD9-8HyNC59Q2MKGfj6wS01jUG?e=ikhYmG
(1) Delete user using top ‘Bulk Actions’ feature: SUCCESS
(2) Delete user using bottom ‘Bulk Actions’ feature: FAILURE
The link discussed in the video screencast is here: https://dev.ksa-uk.net/wp/wp-admin/users.php?s=test&_wpnonce=4244be2804&_wp_http_referer=%2Fwp%2Fwp-admin%2Fusers.php%3Fs%3Dtest%26action%3D-1%26new_role%26layout%3D5e5ea185623d6%26paged%3D1%26action2%3D-1%26new_role2&action=-1&new_role&layout=5e5ea185623d6&paged=1&users%5B0%5D=1465&action2=delete&doaction2=Apply&new_role2