What happened?

First noticed this when I crated this: craftcms/docs#661 (comment)

Description

With this eager loading map:

{% set eager_load_map = [
	[ 'navigation', { with: [
                [ 'topLevel' ],
		[ 'topLevel.detail:entry', { limit: 1 }],
		[ 'elements' ],
		[ 'elements.heading3:entry', { limit: 1 }],
		[ 'elements.link:entry', { limit: 1 }],
	]}]
] %}
{# example follow on call #}
[entryQuery].with(eager_load_map).all()

navigation is an Matrix field in an Entry type on a section dedicated to being the site's main navigation
navigation.topLevel is a Matrix field holding a single block within navigation
navigation.elements is a Matrix field holding many blocks within navigation
The entry within the topLevel & elements Matrix blocks is an Entry Field that in each appearance holds a single entry representing the target of the navigation item.

Note that there are (at least) 2 different Entry types attached to the elements Matrix block but they all have an entry Entry Field.

The issue is that depending how you adjust the map (these bits: navigation.elements:link.entry & navigation.elements:heading3.entry) only 1 of them is ever actually eager loaded. I have tried many different iterations of how to lay this map out but they never all get eager loaded.

My guess here is that navigation.elements:link.entry & navigation.elements:heading3.entry are internally being treated as the same thing, effectively resolving to navigation.elements.entry but only ever applying to one the entry types on the Matrix block - it looks like the order they are defined in the map make no difference.

For reference, the same map, doing a working eager load on Craft 4 is this:

{% set eager_load_map = [
	[ 'navigation' ],
	[ 'navigation.topLevel' ],
	[ 'navigation.topLevel.entry', { limit: 1 } ],
	[ 'navigation.elements' ],
	[ 'navigation.elements.heading:entry', { limit: 1 } ],
	[ 'navigation.elements.link:entry', { limit: 1 } ]
] %}

Trying this on v5 doesn't work in the same way as the first snippet doesn't!

Steps to reproduce

1. Matrix on an entry type in a section called navigation containing:
2. Another Matrix with a single block topLevel containing an entry field called entry
3. Another Matrix with multiple blocks 2 or more of which should contain an entry field called entry.
4. Attempt to eager load navigation, topLevel.entry and navigation.[eitherEntryType].entry

Expected behavior

All the things gets eager loaded.

Actual behavior

Some of the things get eager loaded.

Craft CMS version

5.4.4

PHP version

8.3.7