PPSSPP's default load address

[LunaMoo]

Those bytes aren't used for anything and can't tell you why games do that, maybe it's just sony's specs or PSP sdk, but games follows it and it's exactly same on real hardware and not just some emulation weirdness, that's why it's the most popular code cave for cheats.
You can easily see it if you look at most cwcheats which inject assembly into game code, they store longer scripts at the 0x08800000-0x08804000 range.