No, this actually happened to a friend of mine. Did all his private
training in a Cessna 140 but his CFI recommended taking the checkride
in the C-152 because he needed more time to meet the PTS in the
tailwheel. However, once he received his private he had to surrender
his student ticket, making him not legal for the tailwheel until he got
the proper endorsement. When it comes to checkrides, it comes down to
time. You may be lucky to find one 4 hour time slot in 30 days with an
examiner around here. If you've got to change a student into another
plane to make things work, you do what you have to do. I had to change
a student from a Cherokee to a C-172 1 week before his checkride when
the Cherokee started to look unreliable (I suspected it was going to
need more extensive repairs than the FBO thought, sure enough the A&P
opened it up and said the same thing). It was moving the student into
the C-172 vs.to delay the checkride for 6 weeks until the examiner had
another slot. Most students don't want to move 6 weeks out when they
are expecting to take their checkride next week.

-Robert