I'm working a lot with code blocks right now (copying notes from Joplin to test Nimbus Note) and I've encountered following issues:
1. Duplicating code block which has "hide line numbers" setting on makes the new code block with that setting set to off
2. Additionally to that - duplicating code block with "Alt+drag" option makes the screen to scroll to the top of the note.
This is for Nimbus Web in Firefox.