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After today's version up to 78.5.0, all new letters and reply letters are filled with unreadable characters! How can I fix this?

After today's version up to 78.5.0, all new letters and reply letters are filled with unreadable characters! How can I fix this?
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I found myself the way to solve the question mentioned above. I erased my signature, then I found no unreadable characters in new letters, neither in reply letters. These unreadable characters must be derived from my signature. In signature section of Thunderbird, there is no consistency between latest version and previous version, at least in Japanese language.