radare2 does not assemble right opcodes for instructuction "ld a, 0x63" for gameboy

[gogo2464]

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Work environment

Questions	Answers
OS/arch/bits (mandatory)	ubuntu 19.10 x64
File format of the file you reverse (mandatory)	gameboy save file with gameboy instructions
Architecture/bits of the file (mandatory)	gameboy
r2 -v full output, not truncated (mandatory)	radare2 4.5.0-git 24710 @ linux-x86-64 git.4.4.0-229-g5817770e2 commit: 5817770e290b3c66a3fe57850db6dda1c44c6a19 build: 2020-06-01__20:40:26

Expected behavior

wa ld a, 0x63 should write the opcodes 3e63

Actual behavior

wa ld a, 0x63 actually writes 3663

Steps to reproduce the behavior

I did r2 -w myfile; e cfg.bigendian=false; e asm.arch=gb then wa ld a, 0x63; then r2 still write 3663 that is read as ld [hl], 0x63 by radare2 disassembler;

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[gogo2464]

@condret does this commit https://github.com/radareorg/radare2/commit/c5a2a6562e0cfcb662f8bb1b36726d911c4905bb close the current issue?

[gogo2464]

@condret I made another test with:

:> wa ld [0xcfc7], a Cannot assemble 'ld [0xcfc7], a' at line 3

It also failed. I think I can put it here.

[gogo2464]

@condret when I do wa ld hl, [0xc82e], the new value of hl is 0000. This may be related. Do I open a new issue?