Zabbix 5.2.7 - 504 Gateway Timeout on Trigger Overview and Problems in Dashboard for Admin role

I have a Zabbix cluster orchestrated with a MySQL InnoDB cluster, load balanced Zabbix front-ends, and 2 backends (a primary and secondary). The secondary backend spins up if the primary is offline.

Steps to reproduce:

1. Create a Zabbix account with user role ADMIN access and permissions Read/Write to a Host Group
2. Create a dashboard with Trigger Overview or Problems related to the specified Host Group above

Result:

Expected:

1. When logged in as a user attached to the Super Admin user role: