Naturalization Act of 1790:
"And the children of citizens of the United States that may be born beyond Sea, or out of the limits of the United States, shall be considered as natural born Citizens:"
US Constitution Article II Section I:
"No Person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President; neither shall any Person be eligible to that Office who shall not have attained to the Age of thirty five Years, and been fourteen Years a Resident within the United States."
Naturalization Act of 1795:
No natural born citizen exemption for citizens anymore after 1795 since the time of the Adoption of the Constitution had expired. That language in the 1790 Act was not put in the 1795 Act or any subsequent ones.
There are many possible reasons why the language was not put in the 1795 Act. Your reason that it was some kind of planned temporary period where children of foreign born citizens were considered as natural born citizens is only a guess and I find it least likely.