Appears to work fine here aswell:
MemTest v1.0 - © 2001 desdiSoft
Free memory: 972171620 bytes
CHIP: 2088960. Biggest block: 2088960
Obtained: 0x21d07fd0, 2088960 bytes
Test OK
FAST: 972162988. Biggest block: 968726784
Obtained: 0x21d07fd0, 968726784 bytes
Test OK
The chipmem test getting fastmem is due to fake compatibility chipmem on MorphOS/Pegasos.