Gas does not work when Google spreadsheet starts as a trigger (for example, onOpen()).

when Google spreadsheet is started (when spreadsheet is opened) I'd like to run the gas I created in the script editor.
Either of the following methods will not work at startup:

On the script editor,
in the code .gs (default) script file Write the following code and
If you do it individually, you can see that it works.

function test(){
    Browser.msgBox("Hello!");
}

Close the Script Editor and Spreadsheet

when re-opening the spreadsheet The message box should say "Hello!" but it doesn't.

I can't help it, so I'll delete the above trigger configuration
Rewrite the "test" function itself to "onOpen" as follows

function onOpen(){
    Browser.msgBox("Hello!");
}

Close the script editor and spreadsheet in this state

when re-opening the spreadsheet "Hello!" should be displayed in the message box.
There was still no message.

I think I'm following the proper procedure for both of them.
Is there a mistake somewhere?
(By the way, the account environment is for paid G suite users.)

If you have any idea of this phenomenon, please let me know.