Up until Core Component 2.18.8 the Page v3 was loading all client libraries asynchronously. As it caused issues with client libraries that were not adapted to asynchronous loading (see details in [0]), a new policy configuration to load custom client libraries synchronously/asynchronously was introduced and will be available in 2.19. The default is now synchronous loading.
To keep the same behaviour as before, the new configuration should be set to asynchronous in all the page policies of the WKND sites.
Up until Core Component 2.18.8 the Page v3 was loading all client libraries asynchronously. As it caused issues with client libraries that were not adapted to asynchronous loading (see details in [0]), a new policy configuration to load custom client libraries synchronously/asynchronously was introduced and will be available in 2.19. The default is now synchronous loading.
To keep the same behaviour as before, the new configuration should be set to asynchronous in all the page policies of the WKND sites.
[0] https://github.com/adobe/aem-core-wcm-components/issues/2113