The library example code and the breakout tutorial use pin 8 as reset and pin 9 as DC.
The Shield board is silk-screened with "DC" on pin 8, and reset appears not to be used.
For example, modify graphics_highspeedtest as follows:
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// #define dc 9
// #define rst 8 // you can also connect this to the Arduino reset
#define dc 8
#define rst 0 // reset not used
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// #define TFT_DC 9 // Data/command line for TFT
// #define TFT_RST 8 // Reset line for TFT (or connect to +5V)
#define TFT_DC 8 // Data/command line for TFT
#define TFT_RST 0 // Reset line for TFT not used