It's getting changed because it IS dubcon. The malePC is way too pushy, Taul is way too hesitant and he really just silently submits to all that pushing. This is not about the bet but the moment before he bottoms.I mean, I wouldn't jump to that conclusion unless the writer stated that's his reason.
Although I wouldn't say it's dubious consent. He made a bet that he wouldn't get aroused by a guy, and that if he did he'd be willing to have sex. He got aroused, so that's that lol. No one forced him to make the bet. It was a unique interaction, though it was sad that he breaks it off right after.
To people who don't know:
Taul was meant to be a closeted bisexual ever since V1. It was partially written there and some of that remained in V2 as well, you can even see that in the script.
I imagine he'll open up to the idea during the beach scene more naturally in V3. I know you'll be able to skip the beach stuff completely and still have sex with him later, most likely after some more bonding.