[Beta 9.1] If I modify the default Pages category templates they don't show up in database display settings

When I modify the default Pages index template "Entry and Index" they will not show up in the settings to assign those templates to the database. The template only vanishes when both the Entry and Index templates are modified.

In this photo I modified both the entry and index template for category 2 column and 3 column then save.

When I try to assign those modified template, they don't show up in the database display settings.