Keep previous paragraph node's attributes when user clicks Enter

2

you can just use storeMarks.

first, store the paragraph’ mark and then split the paragraph, and at last use setStoredMarks with you stored marks before within one transaction, like:

   const storedMark = $from.nodeBefore.marks; // you may need to filter some marks like link, etc
   tr.split(pos, 1, pType);
   tr.setStoredMarks(storedMark);