Sorry for the late reply due to the holidays!
I was able to further pinpoint this bug.
Looks like it's because in Apple Notes you were sharing text, but in Chrome you're sharing a webpage.
I tried selecting some text in Chrome and sharing it to Dynalist and it works. On the other hand, I tried sharing a webpage to Dynalist in Safari and that worked. So it looks like there's something different about how Chrome shares a webpage.
This bug has been tracked and we will fix it as soon as we can! Thanks again for letting us know.