is_file() and file_exists() return false on public stream uri

Problem/Motivation

When executing is_file() or file_exists() on a public stream uri, the file doesn't exist because it gets checked for local existence instead of remote.

Steps to reproduce

1. Install stage_file_proxy 1.1 and blazy 2.4 in a D8 or D9 project.
2. Set up a Blazy image formatter on a node image field.
3. Create content using the image field and view the content, the image is not loading.

In my case it is the is_file() function called in web/modules/contrib/blazy/src/BlazyManager.php, line 49.

Proposed resolution

I tried the stage_file_proxy stream wrapper ( #2928564 ✨ Add stage_file_proxy stream wrapper Needs work ) but without luck. No solution yet.

Remaining tasks

Find a solution for using is_file() and file_exists() in combination with stage_file_proxy.