Unable to assign Proud Wildbonder damage as if it wasn't blocked
There's a bug with the trigger of Proud Wildbonder. In this attack, after blockers were declared, I tried to NOT assign damage from Proud Wildbonder as if it were blocked, meaning that I tried to assign damage from it as regular trample damage 1 to the blocker to kill it and the rest to my opponent. When I finished this assignment. Immediately, it gave me a text saying that there is a Illegal damage assignment and state that my other creature with trample Pyrocerotops is not doing damage when 3 is expected, EVEN THOUGH I have not even been asked for damage assignment from Pyrocerotops yet. It gives me a continuous loop where it didn't matter what the damage combinations were, I could NOT command the Proud Wildbonder to do regular trample damage and forced me to choose Proud Wildbonder to do damage as if it was not blocked (only scenario where this whole thing resolved).
I don't think this bug is specific to the card Proud Wildbonder per se, as a similar instance where only Proud Wildbonder was attacking with no spells/creatures flashed in, I could choose to assign regular trample damage. I think the is bug is somewhere with the damage assignment when there are multiple creatures with trample attacking and choosing damage assignment for each of them individually.

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bloodymessjess#00279 commented
I also experienced this bug with Proud Willbonder and Excavation Mole. No problems until both were blocked. I had Proud Willbonder assign damage to the creature blocking it, with one damage trampling over. When I tried to move onto the Excavation Mole assigning damage, I didn't get a message about assigning as though it weren't blocked or anyway to assign numbers to the creatures blocking it. If I pressed ok, it would loop back to assigning damage for the Proud Willbonder. The only way to get out of this loop was to have the Proud Willbonder assign damage as though it weren't blocked, annoying when I wanted to kill the Vulpikeet blocking it.