Some Pages Still Restricted After User Logs In – *See Notes & Video*

We are experiencing an issue where some of the pages on our site remain restricted, even after the user has logged in. There appears to be no consistency in which pages remain restricted, but we notice this bug more often when a logged-out user tries to access multiple pages that are restricted before logging in. The user will have access to the restricted page they logged in from, but some other pages remain restricted even though the user is now logged in.

After remaining logged in for around 10 minutes or so, the user will eventually have access to all the pages they are supposed to have access to. – See link to Video below.

Any assistance in helping us resolve this issue would be greatly appreciated.

Here is a link to a video that shows the issue in detail:
Video Link: https://bit.ly/3o42Ypu
Video Link Password: DlCCUMpIssue112021!

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THINGS WE HAVE TRIED:
Clearing all caches, and UM cache
Turning off all caches that we can
Tested on multiple browsers
Tested by multiple users from different locations and devices
Test on multiple environments (production, staging, dev)
Disabled all plugins except Ultimate Member
Reverted to default theme
Rolled back to earlier version of Ultimate Member

Hosting Info:
WP Engine – with GES (Global Edge Security) on main domain

System Info:
### wp-core ###
version: 5.8.1

### wp-active-theme ###
name: Porto (porto)
version: 6.2.2

### wp-mu-plugins (6) ###
Force Strong Passwords – WPE Edition: version: 1.8.0
WPE ElasticPress Autosuggest Logger: version: 1.0.0
WP Engine Cache Plugin: version: 1.0.5
WP Engine Seamless Login Plugin: version: 1.5.5
WP Engine Security Auditor: version: 1.0.10
WP Engine System: version: 5.0.1

### wp-plugins-active (19) ###
Adminimize: version: 1.11.7
Advanced Custom Fields: version: 5.11
Classic Editor: version: 1.6.2
Contact Form 7: version: 5.5.2
Easy WP SMTP: version: 1.4.7
Google Tag Manager for WordPress: version: 1.13.1
Porto Theme – Functionality: version: 2.2.1
Redirection for Contact Form 7: version: 2.3.6
Relevanssi: version: 4.14.4
Slider Revolution: version: 6.5.8
Ultimate Addons for WPBakery Page Builder: version: 3.19.11
Ultimate Member: version: 2.2.0
Wordfence Security: version: 7.5.6
WP Activity Log: version: 4.3.3.1
WPBakery Page Builder: version: 6.7.0
WP Knowledgebase: version: 1.3.4
WP Rocket: version: 3.10.1
WP Rollback: version: 1.7.1
Yoast SEO: version: 17.5

### wp-server ###
server_architecture: Linux 5.4.0-1043-gcp x86_64
httpd_software: Apache
php_version: 7.4.24 64bit
php_sapi: apache2handler
max_input_variables: 10000
time_limit: 3600
memory_limit: 512M
max_input_time: 3600
upload_max_filesize: 50M
php_post_max_size: 100M

### wp-constants ###
WP_MEMORY_LIMIT: 40M
WP_MAX_MEMORY_LIMIT: 512M
WP_DEBUG: false
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: true

Any assistance in helping us resolve this issue would be greatly appreciated.

Thank you.