Republicans continue to fund PP. It is a very small minority of Republicans that actually want to defund PP.
If they wanted to defund it, they could have easily done so already. It would be easier to defund PP than to push the tax cuts through. They didn't bother with PP because they don't really care.
A few Republicans make the claim to try to raise funds from pro-life people but otherwise it isn't a big issue for them.
They'll fund it because without it, what will they whip their base into a frenzy about???