Thanks Peter. I got through it doing something similar to what you had suggested.
I’ve noticed the 1 repeat frame you mention only in 1080i & 60i projects before and it always seems to be on the 14th or 15th frame (can’t recall). However, I just tried a 50% render on different 23.98 clip as a test and it was smooth but saw that 1 repeat frame as well but it repeats twice.
There must be something funky with the original clip that consistently repeated every 7th frame in the render I mentioned.