From the System Status page:

Theme version 9.2.2
Theme database version 9.2.2

php.ini configuration
Server software nginx/1.15.7
PHP Version 7.3.0-1+ubuntu16.04.1+deb.sury.org+1
post_max_size 128M
max_execution_time 300
max_input_vars 10000
SUHOSIN installed false

PHP extensions
mbstring available
GD library available

WordPress and plugins
WP version 5.0.1
WP multisite enabled No
WP Memory Limit 512 MB/request
WP_DEBUG False

All specs exceed the ones listed in the requirements, we are hosted on Kinsta. This is not caused by system resources or any other server-based issue.

As I have been trying to explain, the problem appeared once the number of Cloud Templates created started increasing. This barely happened when we had only a single template there.

Do you have a suggestion or a bugfix towards a solution or should we give up on trying to use the Cloud Templates? Thanks.

Even after the recent updates, the problem continues.

Cloud Templates is the only section on my Dashboard to keep returning 500 errors. I have disabled all plugins and cache but it was no help.

I have 4 custom templates (Author, Single, Tag, Category) created here, and Cloud Templates > All Templates opened up fine before these were created. As in, there are no problems unless a few templates are created here.

Thanks for checking this out.

I was able to solve this issue by entering get_content into:

Toolset > Settings > Theme support for Content Templates

field, in case it is useful to someone else.

Thanks.