I played this game last around 2014.
I started a new PC account at the beginning of the year, and was enjoying it so much I bought platinum. I also have an old xbox account from 2014 I think, and I bought some platinum on there as well, though not as much. I had 2100 plat on PC, and I think around 400 on xbox.
When I merged for cross save, I started a ticket because I wasn't sure if the wording meant my purchases like Platinum would disappear, or if that was just in-game purchases like blueprints.
My xbox account was much older so it forced that to be my primary account, and linked my pc account to that. So I lost progress on PC, which is fine. But my 2100 plat on PC disappeared. I kept the remaining balance from xbox, I think something like 360 plat.
My feedback is that this is an issue, and while I love the game, this makes me not want to purchase more platinum.
Thanks for reading, I know you guys are probably swamped. The progress on the game and merging across platforms is awesome, keep up the good work!