Tried on the IBM5150, the following were encountered..

1. The punctuation doesn't appear when pasted in.

2. The saved cassette file has no audio, which is why it can't be loaded back.

3. There's this warning (which has nothing to do with the problem)
Quote
Attempt to register save state entry after state registration is closed!
Module timer tag pc_mouse_scan name m_param
Attempt to register save state entry after state registration is closed!
Module timer tag pc_mouse_scan name m_enabled
Attempt to register save state entry after state registration is closed!
Module timer tag pc_mouse_scan name m_period.attoseconds
Attempt to register save state entry after state registration is closed!
Module timer tag pc_mouse_scan name m_period.seconds
Attempt to register save state entry after state registration is closed!
Module timer tag pc_mouse_scan name m_start.attoseconds
Attempt to register save state entry after state registration is closed!
Module timer tag pc_mouse_scan name m_start.seconds
Attempt to register save state entry after state registration is closed!
Module timer tag pc_mouse_scan name m_expire.attoseconds
Attempt to register save state entry after state registration is closed!
Module timer tag pc_mouse_scan name m_expire.seconds


Next, tried on the IBMPCJR.. the paste worked, program ran (horrible game by any standard).

However the same tape problem appeared.

Something for whoever maintains it these days (if anyone).