When I tested version 4.4.1 on Windows 10 I had no problems. With or without attachment. With previous versions like 4.4.0 I also didn’t experience such problems.
PS：Thanks for your patient answer.
I did this experienment again, and I found:
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Everything goes right with me ONLY in GunPG (Command mode)
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Everything goes right with me ONLY in Kleopetra window mode (either Encryption or Decryption ).
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This only happens in Outlook mode (Outlook plug-in problem)?
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Even if when I’m using Mailvelope (Browser integration mode), everything is going fine with me.