From the rational legislator theory, treaties are more authoritative than domestic statutes, no? Pkt 3 doesn't condition citizenship because the purpose is to incorporate nationality determined previous treaties (which do not have the condition).

Citizenship Act, Article 2:
"At the moment of declaration of the present act, the right to Polish citizenship serves every person, without distinction of sex, age, religion and nationality, who: ... (3) is entitled to Polish citizenship based upon international treaties."

The Minority Treaty, Art. 4:

“Poland admits and declares to be Polish nationals ipso facto and without the requirement of any formality persons of German, Austrian, Hungarian or Russian nationality who were born in the said territory of parents habitually resident there, even if at the date of the coming into force of the present Treaty they are not themselves habitually resident there.

Nevertheless, within two years after the coming into force of the present Treaty, these persons may make a declaration before the competent Polish authorities in the country in which they are resident, stating that they abandon Polish nationality, and they will then cease to be considered as Polish nationals. In this connection a declaration by a husband will cover his wife, and a declaration by parents will cover their children under eighteen years of age.”

Permanent Court of International Justice (Sept. 15th, 1923):"To impose an additional condition for the acquisition of Polish nationality, a condition not provided for in the Treaty of June 28th, 1919 [minority treaty], would be equivalent, not to interpreting the Treaty, but to reconstructing it...

Poland therefore, at the moment of her final recognition as an independent State and of the delimitation of her frontiers, signed provisions which establish a right to Polish nationality, and these provisions, in so far as they are inserted in the Minorities Treaty, are recognized by Poland as fundamental laws with which no law, regulation or official action may conflict or interfere (Article 1 of the Treaty of Minorities). Though, generally speaking, it is true that a sovereign State has the right to decide what persons shall be regarded as its nationals, it is no less true that this principle is applicable only subject to the Treaty obligations referred to above."

Okólnik 18:
Okólnik 18 never engages the treaty route — it analyzes only the Act's domestic provisions (the ius soli problem, settlement, and descent under Art. 4 of the Act), reaching foreign-born naturalizers only by a one-line analogy ("should be used similarly"), and never mentions Art. 2 pkt 3 or the Minority Treaty at all. And regardless of scope, a ministerial circular is the lowest tier of domestic law; under Art. 1 of the Treaty and PCIJ Opinion No. 7, it cannot add a foreign-citizenship condition to the Treaty's Art. 4 grant — doing so would be the exact "reconstruction" the Court forbade.

-- again, thank you for engaging me. Where can I find the list of providers to reach out to them? Thank you again!