WordPress admin screen site icon problem

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A site icon will appear when you visit the site.
However, when I move to the management screen and login screen, the site icon disappears. (Confirmed in multiple browsers.)
Login screen /wp-login.php
I know it’s a minor issue, but it’s bothering me, so I deleted and reinstalled WordPress to address this issue.
but it didn’t solve anything.

This problem does not occur in WordPress that I operate on a different domain, so I’m at a loss as to what is causing it.
No problem with photo size.
Changing to the default theme or disabling all plugins doesn’t change anything.

I would like to know what is causing this or how to fix it.

The page I need help with: [log in to see the link]

 

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