Yet that is the problem, you argued X follows without considering that it is only logical to you and not following true logic of the canonized plot or accepting an 'inconsistency' as logically viable.
You argued headcanon with headcanon. Two wrongs don't make a right, and by extrapolating how time works you assume a closed timeline can not be open or altered. Unless you know that is canon, there is no point using it to support an argument. How time flows is simply unknown, therefore you can't actually argue its logical consistency. You are applying real world standards to fiction. You are actually assuming the unknown to formulate an argument, and the truth is you shouldn't be assuming at all.
Like I said with the Beskar spear, whether the Darksaber cuts it or not is the will of the Creators. Any internal logic does not apply considering Beskar is already logically inconsistent to the cobtinuum in itself by its use in the Mandalorian. The inconsistencies are all based on unknown factors which make any explanation viable. Dark saber cuts Beskar spear, doesn't cut Beskar spear, neither needs to be explained by fans because there are unknown factors at play. Trying to fit logic that Darksaber shouldn't cut Beskar is assumption at best, even if we see it happen in another show. We are talking about unknown factors, no need to explain the possibilities. The show creators can explain that the Beskar spear was intentionally forged to break against Darksabers, or Gideon has force/secret empire science powers and used it to enhance the Darksaber cutting power. The show has infinite ways to explain it away, and its not up to the fans to fill in those gaps with 'logic'.