Just looked again and it could be i missed it but it seems that Moshe is not mentioned in Ekev, Re’eh, Shoftim and Ki Seitzei.
But what I wrote earlier doesn’t work too good bc, וידבר ה’ אל משה לאמר is just used once at the beginning of תרומה. The rest is ועשית, this ועדות that.
So that לכאורה diminishes the need for a וידבר משה at the beginning of תצוה.
Unless you want to say the etzem beginning of a parshas, but that’s shver to say bc מהיכי תחתי that the parshiois hashavua imply an automotive disruption in עניין that requires a new וידבר.
אדרבה, tetzaveh conceptually is just a continuation of ענייני משכן.
Unless the need for ה’ to say ואתה or ואתה תצוה, i.e. the ציווי aspect implies some new thing.
It’s probably the ואתה part of it as we never see this formulation used in the beginning of a דיבור. And here is is used three times in a row 2 at the beginning of a parsha and one in the middle.
In any case it’s still not קלאר.