WordPress多站点插件激活报错：插件文件不存在及致命错误排查

问题现象 #

• 删除所有插件和主题后，出现警告：The plugin 0 has been deactivated due to an error: Plugin file does not exist.
• 重新上传干净的最新版插件和主题后，尝试网络激活任意插件均触发相同提示的致命错误

debug.log日志信息 #

[28-Aug-2024 16:48:21 UTC] Cron reschedule event error for hook: action_scheduler_run_queue, Error code: invalid_schedule, Error message: Event schedule does not exist., Data: {"schedule":"every_minute","args":["WP Cron"],"interval":60}
[28-Aug-2024 17:28:51 UTC] PHP Fatal error:  Uncaught TypeError: Cannot access offset of type string on string in /var/www/html/wp-admin/includes/plugin.php:708
Stack trace:
#0 /var/www/html/wp-admin/plugins.php(60): activate_plugin()
#1 /var/www/html/wp-admin/network/plugins.php(13): require('...')
#2 {main}
  thrown in /var/www/html/wp-admin/includes/plugin.php on line 708

已执行的排查操作 #

• 上传除wp-content和wp-config.php外的干净WordPress核心文件
• 检查并清空各站点active_plugins表及active_sitewide_plugins表的meta_value字段
• 上述操作后问题仍未解决，无法定位故障根源

内容的提问来源于stack exchange，提问作者Jonathan Kleemann