App note from Alpha & Omega Semiconductor on added input protection for USB-C against voltage spikes/ringing that can damage the inputs of USB-C power switches. Link here (PDF)
USB Type C protection power switches such as the AOZ132xDI and AOZ1398xDI product family (AOZ1327/1376, AOZ13984/13987/13929) are powerful and effective protection ICs, which protect downstream devices from any abnormal power situation such as over/under voltage, over/surge/reverse currents, overpower, and over-temperature conditions, to name a few.
However, the type C power switch needs protection when the voltage spike goes over its limit, i.e., Plug/unplug events. It is violent affairs that can interact with board and cable inductances and input capacitances to produce voltages beyond the maximums allowed by the internal control circuit. Another case is the part shutdown at faults with high peak current. In this case, the fast shutdown can make the input cable inductance resonant with input caps, causing the high input ringing voltage. For this case, enough input caps can slow down the ringing frequency and lower the ringing voltage. In both cases, the overvoltages can be controlled or eliminated by using enough input capacitors, proper component placement, and transient voltage suppressors (TVS)