Have you taken a look at the source? A lot of code is missing, and more gets redacted with every release. It's pretty clear apple don't welcome contributions and make source buildable
20 karma · joined January 20, 2020
For example, how do you know if calling a API will crash the browser?
https://bugs.chromium.org/p/chromium/issues/detail?id=118336...
Actually it doesn't, Affinity open the embbded pdf in Ai file, some metadata like textframe/alignment does not exist in pdf.