Making an Appendix to the Labor Contract Extending the Contract Duration by 3 Months: Is It Permissible?
According to Clause 2, Article 22 of the 2019 Labor Code:
The labor contract appendix specifies, amends, and supplements a number of provisions and articles of the labor contract but is not permitted to amend the term of the labor contract.
Thus, the labor contract appendix is not allowed to amend the term of the labor contract. Therefore, in your case, the company's creation of a labor contract appendix to extend the term of the contract is against labor law regulations.
Therefore, this labor contract appendix will not be effective.
Respectfully!

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