Come form #9362
The comment in code says that interactive input should works

• with -File:
  

  PowerShell/src/Microsoft.PowerShell.ConsoleHost/host/msh/CommandLineParameterParser.cs

  Lines 1133 to 1141 in ceed73d

  	// Process interactive input...
  	if (args[i] == "-")
  	{
  	// the arg to -file is -, which is secret code for "read the commands from stdin with prompts"
  	_explicitReadCommandsFromStdin = true;
  	_noPrompt = false;
  	}
  	else

• with -Command:
  

  PowerShell/src/Microsoft.PowerShell.ConsoleHost/host/msh/CommandLineParameterParser.cs

  Lines 1296 to 1304 in ceed73d

  	else if (args[i] == "-")
  	{
  	// the arg to -command is -, which is secret code for "read the commands from stdin with no prompts"
  	_explicitReadCommandsFromStdin = true;
  	_noPrompt = true;
  	++i;
  	if (i != args.Length)

The comments differ in "no prompts" vs "with prompts" - it is not clear is it comments and behaviors right.

Also using dash is documented only for -Command (not for -File)
https://docs.microsoft.com/en-us/powershell/scripting/components/console/powershell.exe-command-line-help?view=powershell-6#-command

Steps to reproduce

pwsh -file C:\temp\q1.ps1 -

Expected behavior

pwsh -file C:\1\q1.ps1 -
<wait interactive inout>

Actual behavior

pwsh -file C:\1\q1.ps1 -
-

Expected behavior

pwsh -command -
<wait interactive inout>

Actual behavior

'-' was specified as the argument to -Command but standard input has not been redirected for this process.

Usage: pwsh[.exe] [[-File] <filePath> [args]]
                  [-Command { - | <script-block> [-args <arg-array>]
                                | <string> [<CommandParameters>] } ]
                  [-ConfigurationName <string>] [-CustomPipeName <string>]
                  [-EncodedCommand <Base64EncodedCommand>]
                  [-ExecutionPolicy <ExecutionPolicy>] [-InputFormat {Text | XML}]
                  [-Interactive] [-NoExit] [-NoLogo] [-NonInteractive] [-NoProfile]
                  [-OutputFormat {Text | XML}] [-Version] [-WindowStyle <style>]
                  [-WorkingDirectory <directoryPath>]

       pwsh[.exe] -h | -Help | -? | /?

PowerShell Online Help https://aka.ms/pscore6-docs

All parameters are case-insensitive.
-

Environment data

Name                           Value
----                           -----
PSVersion                      6.2.0-rc.1
PSEdition                      Core
GitCommitId                    6.2.0-rc.1-204-g262d86c691519ff7d5adacbae6424e2c87accce6
OS                             Microsoft Windows 10.0.17763
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0