Seemingly-obscure `${<file path>}` feature broken on Linux

Prerequisites

• Write a descriptive title.
• Make sure you are able to repro it on the latest released version
• Search the existing issues.
• Refer to the FAQ.
• Refer to Differences between Windows PowerShell 5.1 and PowerShell.

(I must note that searching the Issues page for "${" is either not possible or very difficult since there are no results, sorry if this happens to be a dupe!)

While reading the PowerShell Wikipedia page, I cane across a sentence that described a feature I have never seen documented:

Enclosing the path to a file in braces preceded by a dollar sign (as in ${C:\foo.txt}) creates a reference to the contents of the file. If it is used as an L-value, anything assigned to it will be written to the file. When used as an R-value, the contents of the file will be read. If an object is assigned, it is serialized before being stored.^{[citation needed]}

This works on both Windows PowerShell and Core, but not on Core for Linux.

Steps to reproduce

On a Linux system, write

${/etc/profile} # (or any other file that exists)

Expected behavior

PS> ${/etc/profile}
< contents of /etc/profile here... >

Actual behavior

PS> ${/etc/profile}
< no output >

Error details

n/a

Environment data

Name                           Value
----                           -----
PSVersion                      7.5.1
PSEdition                      Core
GitCommitId                    7.5.1
OS                             Debian GNU/Linux 12 (bookworm)
Platform                       Unix
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0

Visuals

No response

Reproduce the issue on Linux with ${/etc/profile} and compare the result with Windows PowerShell and PowerShell Core. Trace the handling of this file-reference syntax and verify the fix by confirming that an existing file's contents are printed on Linux without regressing the documented Windows behavior.