I've flagged over 20 posts which have since been deleted. However my flag list only shows flags on posts which weren't deleted.
My flags: https://e621.net/post_flags?search%5Bcreator_name%5D=Kyiiel
Additionally, searching for flags in the 'deleted' category causes the following error:
https://e621.net/post_flags?commit=Search&search%5Bcategory%5D=deleted
An unexpected error occurred. Log ID: 9ea6cc10-23f2-449e-bdee-4ed7b599b10f