If this is an issue of the preview seen in LrC Library coming from the camera embedded preview, and thus reflecting the in-camera image style settings, then in due course this will be replaced with a new preview. This is made by LrC from the ground up according to its own processing. And that is also what should be seen immediately in Develop.
So: do these images look "vivid" in Develop, or do they look "normal"? If the problem is only in Library, how do you know these are 1:1 previews and not ones extracted from the camera file? I guess the confirming test for that, would be to change the camera into an obviously different image mode, and then see what then happens with the preview inside LrC.
In Develop, are these images using the camera profile that you were expecting to see? (at the top of Basic panel). AFAIK this is where the "Camera Settings" import option would manifest itself. But also, if you had some customised default processing set up for this camera as distinct from others, or if you were applying a chosen preset during import, that'd be evident in the Basic and the other image settings. And, would be within your control to set differently.
There is a fairly common colour-management related complaint of images looking different between Library and Develop. But if such a difference is only seen for these images, and not other images, I don't see how this could apply.