Multisite + PHP 8 Error on Admin access

[NgJason]

Describe the bug
There has been a critical error on this website.

PHP error message:
TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, first array member is not a valid class name or object in

To Reproduce
Steps to reproduce the behavior:

1. Install Multisite with PHP 8+
2. Download the latest Total Upkeep and network activate
3. Go to any admin page and it is erroring out

Expected behavior
Should not error out

Additional context
This has happened on a Bitnami / AWS Lightsail stack. (PHP 8.1.13)
This also happens on a local DevKisnta Stack (PHP 8)

From my own investigation so far, this code failed to instantiate

`
boldgrid-backup\admin\class-boldgrid-backup-admin-core.php

 if ( Boldgrid_Backup_Admin_Utility::is_active() ) {

      $this->auto_updates = new Boldgrid_Backup_Admin_Auto_Updates();

 }

`

because is_active() returns false.

Upon checking further,

get_option( 'active_plugins', array() ) doesn't return the plugin in the list.
update: from my research, ^ call may not be supported correctly on multisite.
https://wordpress.stackexchange.com/questions/298241/how-do-i-get-slug-of-all-active-plugins-programmatically#answer-298243