With Dynamic Field Translations enabled, Product Duplicate runs until the PHP-FPM/Nginx timeout

[Martin Soluce]

Enabling Configuration → System Settings → General Settings → Localisation 

With Dynamic Field Translations enabled, Product Duplicate runs until the PHP-FPM/Nginx timeout.

PHP-FPM slowlog shows execution repeatedly inside WHMCS core classes: WHMCS\Language\Loader\DatabaseLoader, DynamicTranslation, Sanitize::purifyHtml(), and HTMLPurifier.

With it disabled, the exact same operation completes within seconds.
 

WHMCS Admin:
Configuration → System Settings → Products/Services
Action: Duplicate Product

Dynamic Field Translations ENABLED:
- request runs >300 seconds
- ends in 504 Gateway Timeout

Dynamic Field Translations DISABLED:
- same product duplicates within seconds

PHP-FPM slowlog:
script_filename = .../ordadmin/configproducts.php

Stack:
convertFromUTF8()
HTMLPurifier::purify()
WHMCS\Input\Sanitize::purifyHtml()
WHMCS\Language\DynamicTranslation::getTranslationAttribute()
WHMCS\Language\Loader\DatabaseLoader::load()
Symfony Translation\Translator...