Wagtail CMS Translation Tool Flaw: Bulk Operations Break Page Tree Metadata

A critical bug in Wagtail-Localize's subtree translation feature silently corrupts page tree metadata, rendering child pages invisible in the admin despite successful creation. This discovery exposes a crucial gap in bulk operation handling where metadata synchronization is overlooked, a serious concern for developers deploying multilingual Wagtail sites. The incident underscores how complex CMS architectures require meticulous attention to data consistency across all operations, not merely primary data creation.