I was trying out the REPL to see it produce other code (rust) but the menu closes before I have a chance to select it.
This is manifested in firefox. On the same VM, the brave browser does allow the dropdown.
This is a VM running LMDE5 from a windows 11 host.
A video of the issue is at:
https://drive.google.com/file/d/1SCDic9rLzTMfVDtDHAiadZ5r_DXMj7Wu/view?usp=sharing