Failed to parse the begin key of a given keyspace

[JaySon-Huang]

> ./pd-ctl -i
» region 2988366876
{
  "id": 2988366876,
  "start_key": "78000DA200000000FB",
  "end_key": "78000DA274800000FF00000000535F7200FE",
  ...
  "buckets": [
    "78000DA200000000FB",
    "78000DA274800000FF000000003C5F7280FF000000008ED2A800FE",
    "78000DA274800000FF00000000535F7200FE"
  ]
}

mok failed to parse the begin key of it

>  mok 78000DA200000000FB
runtime: goroutine stack exceeds 1000000000-byte limit
runtime: sp=0x140208803d0 stack=[0x14020880000, 0x14040880000]
fatal error: stack overflow

runtime stack:
runtime.throw({0x1036a717b?, 0x104032a20?})
	/opt/homebrew/Cellar/go/1.19.6/libexec/src/runtime/panic.go:1047 +0x40 fp=0x16d496d50 sp=0x16d496d20 pc=0x102e8bab0
runtime.newstack()
	/opt/homebrew/Cellar/go/1.19.6/libexec/src/runtime/stack.go:1103 +0x464 fp=0x16d496f00 sp=0x16d496d50 pc=0x102ea5094
runtime.morestack()
	/opt/homebrew/Cellar/go/1.19.6/libexec/src/runtime/asm_arm64.s:316 +0x70 fp=0x16d496f00 sp=0x16d496f00 pc=0x102eb9560

goroutine 1 [running]:
runtime.heapBitsSetType(0x1401b202400?, 0x40?, 0x40?, 0x10397ffe0?)
	/opt/homebrew/Cellar/go/1.19.6/libexec/src/runtime/mbitmap.go:844 +0x980 fp=0x140208803d0 sp=0x140208803d0 pc=0x102e692d0
runtime.mallocgc(0x40, 0x10397ffe0, 0x1)
	/opt/homebrew/Cellar/go/1.19.6/libexec/src/runtime/malloc.go:1050 +0x63c fp=0x14020880440 sp=0x140208803d0 pc=0x102e609cc
runtime.newobject(0x1041fd8b0?)
	/opt/homebrew/Cellar/go/1.19.6/libexec/src/runtime/malloc.go:1202 +0x2c fp=0x14020880470 sp=0x14020880440 pc=0x102e60dcc
main.N(...)