Is it reasonable for the company to require employees to sign attachments before allowing them to resign?

None of the above agreements is legal. Since it is illegal, it is an invalid clause. You don't have to obey them, so signing them has no legal effect. Please feel free to sign.

It is a retrogression of history that such a thing should happen in this world. What city are you in?

Resignation wages are required to be settled and paid on the day when the handover procedures are completed, otherwise they are in arrears and may require the unit to compensate for the losses.

If you leave your job for three months and don't let people go to work, does the unit still pay wages every month to support employees? What an asshole.

It is forbidden to bring negative influence to the unit, and the definition is unclear. It is legal to apply for labor arbitration or to defend rights through media such as the Internet. Otherwise, it is said that maliciously creating negative news for the unit will be investigated for legal responsibility.

Why should employees be left to take responsibility for the dispute two years ago? Are you kidding?