New buffers keep forgetting their Package.

[David A. Levitt <LEVITT at MIT-MC>]

In Experimental Remote-File 7.0, Experimental LMFILE-Remote 15.1,
Experimental MIT-Specific 7.0, Experimental System 85.12,
Experimental ZMail 44.3, Experimental Play 6.2, microcode 117, 60.72 Hz, on Lisp Machine Nine:

After working in BUFFER-1 for a while, I did Set Package,
named it and wrote it out.  But every time I enter the error-handler
or visit another buffer, I'm in USER when I get back.