Theme doesn't show message icons

Hello, I would like to ask about message icons. It doesn’t display the message icon I made on my customer’s phone, Galaxy S24 Ultra, and on my family’s phone, Galaxy A25 5G.
Does anyone know? What caused it? Or is it every model? Or is it only the new model?
Thank you in advance.

The messages app used there is Google’s Messages. The theme will customize only Samsung Messages app.

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I didn’t check in detail. Thank you very much.