Gene Fuller wrote:
"Waves go into the interface (plane, discontinuity, whatever) and come
back out."

A conductive plane produces a reflection and a phase reversal.

Terman writes in his 1955 opus on page 92:
"(Transmission Line with Short-circuited load.) However, the reflection
now takes place with reversal in phase of the voltage without change in
the phase of the current. The result is that the current in each wave at
the load is half the load current, while the voltages in the two waves
add up at the load to a resultant of zero voltage as obviously required
across a short circuit."

Best regards, Richard Harrison, KB5WZI