Thanks, didn’t know. To keep it clean, I removed my post. You may consider removing your clarifications too.
Could you try your code in a plain Julia REPL (no jupiter?), just to be sure, it’s not something which comes with combination Jupiter+Revise.
A MWE would also be nice. which reproduces your problem. Maybe with some minimal code from A2_src.jl. (Please read: make it easier to help you)