DLC doesn't work in any game

[KickMeElmo]

I've ignored this for years because I assumed it simply wasn't supported without having a CFW PSP to decrypt them, but based on what I've been reading today that's not the case. This applies to Ape Quest, Dissidia 012, LittleBigPlanet PSP, Patapon 3, etc. I directly copied the game directories from my PSP itself, including the .edat DLC files. They're located in the memstick directory structure in the proper locations. These games are eboots, not isos. This issue has been present on Windows, Linux, and Android for me. My PSP has a fractured screen and damaged buttons, so while I technically could attempt to load them back to check for updates, that's not going to be a fun process. That also shouldn't be necessary, as I'm fairly sure I had them updated fully before transfer. Am I just missing some detail?

tl;dr: I'm using legally owned games and DLC copied from my PSP's memory stick unmodified, when placed in the correct directories DLC still doesn't work on any platform.

EDIT: Retested today, Android version 1.6.3-301-ge51ea8561, Linux version v1.6.3-276-g53f1624