Missing content in the header fileds in the saved messages
If I save a message on my computer and then open it again, the contents of the fields "From" and "To" are missing in the header (sometimes also in the "Subject"). By clicking on the "Reply" button, the contents of the fields become visible again (see picture below). By opening directly from the inbox in thunderbird everything is visible. The locally saved messages can also be opened with another mail client without problems. The issue was confirmed on several PCs.
System: Thunderbird 78.3.2 (32-bit) Add-ons: CardBook PC: Windows 10 Pro 64 Bit
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