There is confusion in your understanding here.
For example: your confusing various senses of the term “tradition”.
And the idea that one can not go to confession after a serious sin and go then to Holy Communion is simply NOT part of Sacred Tradition or Apostolic Tradition.
scborromeo.org/ccc/p1s1c2a2.htm#I
Catechism:
Apostolic Tradition and ecclesial traditions
83 The Tradition here in question comes from the apostles and hands on what they received from Jesus’ teaching and example and what they learned from the Holy Spirit. The first generation of Christians did not yet have a written New Testament, and the New Testament itself demonstrates the process of living Tradition.
Tradition is to be distinguished from the various theological, disciplinary, liturgical or devotional traditions, born in the local churches over time. These are the particular forms, adapted to different places and times, in which the great Tradition is expressed. In the light of Tradition, these traditions can be retained, modified or even abandoned under the guidance of the Church’s Magisterium.
(not that I am saying that such would be part of a local tradition or not in some place)