Hi I am using 1.16.4 with forge 35.1.37 and version 1.16.4-0.0.4.11 of Lootr.

As far as I can tell the chests for Pirates and looters are just normal chests.

https://www.curseforge.com/minecraft/mc-mods/pirates-and-looters-mod

Unfortunately, this is an all-rights-reserved mod and the source isn't visible. The only thing I can suggest is contacting the author and ensuring that they're using the static LockableLootTileEntity::setLootTable method instead of interacting directly with the tile, as Lootr is unable to catch the latter.

Normally I would make a pull request myself to fix it, but in this instance, there's not really much I can do.

This appears to be an MCreator mod. I'm not sure whether it would ever be possible to add compatibility.

Thank you for your efforts. I understand, I was not aware it was an mcreator mod. It does explain some things.

No worries! As far as I'm aware the MCreator license previously prevented authors from modifying their code. This may have changed in the past year or so, but unfortunately I don't see much chance -- or a way to contact the author directly.

That is fine. I was wondering why the trees it adds does not drop saplings when harvested. Now I know. Its not a bad mod, it works on a server and has not been the cause of a crash, but I know that mcreator mods are like homemade bread by an amateur cook, never know if the center is fully cooked. I will just keep it as is for now. Its not that big of a deal. Players can be just like the pirates and plunder the loot before anyone else gets there.