Material submenu in separate component doesn't open on mouseover

### Is this a regression?

- [x] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

14

### Description

Creating a menu component as a library when the nested menu is in a separate component. The basic functionality of the menu is to hover over it, a nested menu should be opened. However, when the nested menu is in a separate component, on hover of the parent options, the nested menu is not opening.

This functionality was working fine in angular v14, after upgrading to 15.2.9 we are facing this issue

NOTE: The same functionality will work if the nested menu is in the same component.

### Reproduction

StackBlitz link: https://stackblitz.com/edit/angular-bifan2?file=src%2Findex.html

### Expected Behavior

To open the menu on hover when the nested menu is in a separate component

### Actual Behavior

The menu on hover is not working when the nested menu is in a separate component

### Environment

package.json versions

"@angular/animations": "15.2.9",
"@angular/cdk": "15.2.9",
"@angular/common": "15.2.9",
"@angular/compiler": "15.2.9",
"@angular/core": "15.2.9",
"@angular/forms": "15.2.9",
"@angular/material": "15.2.9",

Start with the linked StackBlitz reproduction and compare the nested-menu hover behavior between Angular 14 and Angular 15.2.9. Trace the Angular Material menu behavior when the nested menu is in a separate component. Done means hovering the parent option opens the nested menu, matching the behavior when both menus are in one component.

Written by the indexing model from the issue text.