The fix for the LIST command bug in the original source is pretty simple.
You have to increment the pointer so the loop doesn't get stuck on the same character..

Change this code:

LE49C         stab      UNCRFL              ; store flags byte
                      jsr       RVEC12              ; call UNCRUNCH extension hook
                      cmpa  #$C8                ; compare with highest token value (MEM)
                      bhi      LE462               ; output exclamation point (!) for invalid tokens
   

To this:

LE49C         stab      UNCRFL              ; store flags byte
                      jsr       RVEC12              ; call UNCRUNCH extension hook
                      cmpa   #$C8                ; compare with highest token value (MEM)
                      ble      skip
                      inc      TMPTR1

                      bra      LE462               ; output exclamation point (!) for invalid tokens

skip

This raises a question.  With numerous stories of people trying to load CoCo BASIC programs into the MC-10 when they were kids, why didn't anyone mentions this bug?