Not sure which mod is causing it, but I am using this mod with the Builder Bot Start mod and something weird is happening. I cleared my inventory, then suicided to a demolisher in space age and respawned with a brand new, fully kitted out legendary armor, complimentary with more legendary bots. My previous armor, that I took off before dying, was still in a chest. This is a duplication glitch/bug.

Not that I mind having free overpowered stuff whenever I want, but it should probably be patched, maybe with an option to enable it anyway.

Link to Builder Bot Start mod that I am using for reference: https://mods.factorio.com/mod/BuilderBotStart

Update: author of Builder Bot Start mod confirmed this was not a bug but instead how they get the builder bot start stuff for existing save games (instead of only getting the bot start equipment on game start).

Sorry to bother you!