Yea I can’t find anything for PromptBundlePurchase call and its limits. Trying to do searches leads me back here on this post, or its announcement post about it. (or other posts on how to use it, but nothing about the limits of it)
I would assume its the same, Since it can be made now by UGC creators. But I can’t find any sources that provide it’s limits other then the post I made above, just again, sounds similar to the limits your reaching now. Maybe try respecting the limits above and see if you get any errors of this “rate limit” issue without breaking the above limits (to see if there is any other limits).
I would assume it’s not a bug, as I’m sure roblox has limits on these types of calls, it’s just annoying that they aren’t clearly provided on the roblox docs or annoucement developer forum posts etc.