I have observed a weird issue with button-lock and org-mode. It is reported in detail here:

The gist is if I use button-lock and try to open the repl of a python source block, the repl is read-only. But without button-lock it works fine.

I have tracked this down to the line:

Up to this line, the repl is interactive, but after that line, when button-lock has been used, the repl becomes read-only. I am baffled on how to even proceed with debugging. Any ideas?