No, its covered in the Polish Citizenship Act of 1920.
The issue of losing one’s citizenship before 1962 is complex, and the different principles of the law governing it are the following:
A person born before the 1951 law entered into force may inherit only the Polish citizenship of their father if their parents were married, or their mother-otherwise.
A person who joined a foreign army (even if never served but was only conscripted on paper), worked in a public job in a foreign country (very wide and volatile definition for that but this includes: teacher, religious leader, postman and even in a territory not defined as a country like British Palestine ) or received any foreign citizenship prior to the entry into force of the law of 1951 - loses their citizenship immediately, and if a married man, also his wife and minor children (younger than 18) lose their citizenship.
Nevertheless, if they were not exempt from Polish army duty then only getting foreign citizenship will not revoke their Polish one. Public work and army register will always cause the loss of citizenship. Therefore, an adult unmarried women have lost their citizenship on obtaining foreign citizenship before 1951, because they had no military duty in Poland. Married women stayed under the "protection" of their husband's citizenship and kept it as long as the husband didn't lose it.
On the other hand, in the case of men there are two conditions which need to prevail: men who both got foreign citizenship and passed the age of Polish military duty (50 since the law changed on May 29, 1950) had lost their citizenship.
In any case, foreign citizenship will cause the loss of an adult’s Polish citizenship only if he was naturalized i.e. those who obtained citizenship by birth ( e.g. in USA or Israel, even if born in Palestine and got Israeli citizenship once the state was established etc.) , did not lose their Polish citizenship.
A person who obtained a foreign citizenship (non Polish) due to the changes of the borders after WWII, or had Russian, Ukrainian, Belarusian, Lithuanian, Latvian or Estonian citizenship in 1951 had lost his Polish citizenship (see clause 4 of the second law). Nonetheless, if the ex-Pole returned to Poland afterwards due to the different agreements of repatriation that were signed between the USSR and Poland (e.g. in 1945 and 1956), then they regained his Polish citizenship. In fact, every Pole that became a Soviet citizen and did not take advantage of the opportunity to come back to Poland due to these agreements, lost their Polish citizenship.
In order to confirm the citizenship of a person who left before 1951, it will be easier to prove that he left Poland after the first law from 1920 entered into force. Otherwise it will be difficult to prove his Polish citizenship. If the parents stayed in Poland after 1920 it might help.
The law from 1920 allows for citizenship to pass from father to his born-out-of-wedlock child only if the father declared his paternity before the child turned 18 and only in front of Polish authorities. Hence, without an original birth certificate with the father's name it might be difficult to prove.
The law from 1962 allows for citizenship to pass from father to his born-out-of-wedlock child only if the father declared his paternity within one year from birth. Hence, such children of only a Polish father (mother is not Polish) born when this law was in force must show an original birth certificate or a paternity declaration signed before they turned one year old (in Israel, this declaration is usually done in the hospital, when registering as the newborn's father and it is saved in the archives of the Ministry of Interior and a copy of it can be issued on request).
The issue of citizenship of children whose parents had different nationalities was regulated not only in the provisions of the Act on Polish Citizenship, but also in the international agreements ratified by Poland in the field of citizenship. This means that, in such a case, the provisions of the Polish Citizenship Act were not applied. In the 60s and the 70s Poland signed with some countries of the Central and Eastern Europe the conventions on avoidance of multiple nationality from which withdrew in the 90s and 2000s.[7]