bug: ion-select placeholder overlaps label when select has focus and labelPlacement="floating" #30401

Prerequisites

• I have read the Contributing Guidelines.
• I agree to follow the Code of Conduct.
• I have searched for existing issues that already report this problem, without success.

Ionic Framework Version

v8.x

Current Behavior

When an ion-select with labelPlacement="floating" is focused, the placeholder is shown but the label remains in non-floating position, causing an overlap:

(in this screenshot has-focus is manually set on all selects at once for illustrative purposes, in normal use only one select can be focused at once)

Expected Behavior

One of these two options:

• The placeholder is not shown
  

• The placeholder is shown and the label floats
  

Steps to Reproduce

1. Open the reproduction URL
2. Click anywhere on the page, the use Tab to focus the ion-select elements

Code Reproduction URL

https://stackblitz.com/edit/pxhxnc4c-tltkbxwu

Ionic Info

Ionic:

Ionic CLI : 7.2.1
Ionic Framework : @ionic/angular 8.5.7
@angular-devkit/build-angular : 19.2.11
@angular-devkit/schematics : 19.2.11
@angular/cli : 19.2.11
@ionic/angular-toolkit : 12.2.0

Utility:

cordova-res : not installed globally
native-run : not installed globally

System:

NodeJS : v20.19.1 (/usr/local/bin/node)
npm : 10.8.2
OS : Linux 5.0

Additional Information

The rule setting the placeholder opacity to 1 when the select .has-focus overrides the rule hiding the placeholder when it is :not(.label-floating)

Another related bug is that the opacity gets overriden with 1 instead of var(--placeholder-opacity), causing the placeholder to appear black instead of gray. See #30402.