Many irrelevant test failures:
Undefined index: plid Notice menu.module 198 menu_enable()
A hook_menu() implementation tries to use/retrieve a service that is registered by a module (bundle) -- which causes menu_router_rebuild() to blow up.
menu_router_rebuild() contains a try/catch block, so the actual exception is hidden. As a result, menu_enable() does not find any links in the menu links table.
The actual exception thrown is:
DependencyInjection... "The service definition "plugin.manager.system.plugin_ui" does not exist."
However, this service is registered on the container in a
SystemBundle in that patch.
SystemBundle::build() gets invoked. But possibly too late or whatever.