Why whole sentence is printing in other font instead of Arial when special char is added which is not supported by Arial

We are applying Arial Fonts to texts. When any special char is added to the text which is not supported by Arial whole sentence is printed with some other fonts. Is this possible to print only those chars that are not supported in Arial rather then whole sentence?

We don’t want to introduce any other fonts/ttf.

Happy case:

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The whole sentence is printed in a different font when any special char is added which is not supported by Arial.

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Expectation: I want to print Aim in Arial and Ⓕ in any other font as this is not supported in Arial.

I found solutions in different Aspose pdf products, Any equivalent solution for the below problem in the .Net Aspose pdf generation tool?

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@Shambhu1997

A ticket for similar requirement has already been logged in our issue tracking system with the ID PDFNET-52764. Ticket has been linked with this forum thread as well. Its investigation is planned for the next month and you will receive a notification as soon as the ticket is resolved. Please spare us some time.