WSL notifications don't work

When running the SimpleX Chat terminal app v5.0.0.2 on WSL2 (1.2.5.0), I get the following error whenever a notification should appear:

> /home/jonathan/.simplex/win-toast-notify.ps1 : AuthorizationManager check failed.
At line:1 char:1
+ /home/jonathan/.simplex/win-toast-notify.ps1 "jonathan_1> " "hello"
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : SecurityError: (:) [], PSSecurityException
    + FullyQualifiedErrorId : UnauthorizedAccess

When I run powershell.exe ~/.simplex/win-toast-notify.ps1, I can interactively give permission to run the script once:

Security warning
Run only scripts that you trust. While scripts from the internet can be useful, this script can potentially harm your computer. If you trust this script, use the Unblock-File cmdlet to allow the script to run
 without this warning message. Do you want to run \\wsl.localhost\Ubuntu\home\jonathan\.simplex\win-toast-notify.ps1?
[D] Do not run  [R] Run once  [S] Suspend  [?] Help (default is "D"):

I attempted to get rid of the warning by entering powershell.exe from within WSL in that directory and running " Unblock-File -Path .\win-toast-notify.ps1`, but this does not fix the problem.

Start with /home/jonathan/.simplex/win-toast-notify.ps1 and reproduce the notification command under WSL2 using the reported PowerShell invocation. Investigate why the script still triggers AuthorizationManager after Unblock-File, and consider the issue done when WSL notifications run without an authorization prompt or security error.