I will attempt to view it based on the concepts of Karma.
By completing the 8 precepts, the merits are definitely generated and one will enjoy the fruits of these merits (in this case, a rebirth in the happy realms).
Going by the rule * Karma Is Definite – Reaping What Is Sown, the Karma will not be “eliminated”.
Similarly, by indulging in other non-virtuous acts for the other days, one is creating new Karma that will eventually ripen and cause suffering. Depending on the weight of these new Karma, they could ripen earlier if it was a serious action.
However, I read from Master Ri-Chang’s lamrim commentary (track 122b) that there are cases in which there is destruction of the roots of virtue ( 善根).
Still, there are many wrongs other than anger that combine both production of a terrible fruition and destruction of the roots of virtue:
【然能双具引大异熟及坏善根所有恶行。】
wrong views that deny cause and effect; abandoning the sublime teachings; generating pride in relation to bodhisattvas, gurus, and the like and thus terribly belittling them; and so forth. You can know of these from the 《Compendium of Trainings》.
【除瞋而外余尚众多，谓诽谤因果所有邪见，及谤正法，并于菩萨尊长等所起大轻蔑，生我慢等，如《集学论》应当了知。】**
You can go through the following Lamrim Commentary Tracks to understand better. Do an on-page search for “善根”
The concept of Karma is not straightforward. Thankfully, we have Teachers to guide us through it.
