Non-DLC owners get those Buy messages when using its content or when trying to take it from the ground or any other storage inventory.
Issue is (for me at least) that there's no screenshots/images of Marksman DLC content in those messages, like Apex has I noticed three issues.
1. I get semi-transparent dark square/rectangular shaped message with below blue rectangle white text in it saying to buy this DLC to remove the messages.No screenshots/images of Marksman DLC content in those messages, It's same forlike the message that appears on the right side of the screen all the timeApex expansion has.
There's also an issue with the inventory side of things. In the inventory Apex have those green triangle shapes with its logo in it to mark that this content is premium. Now for Marksman DLC, on its content in the inventory,2. it's just blank white squared shapeNo Marksman DLC logo in tiles that randomly cover the hole screen.
I do not have Marksman DLC3. In the inventory Apex have those green triangle shapes with its logo in it to mark that this content is premium. Now for Marksman DLC, on its content in the inventory, it's just blank white squared shape.