In my case, yes, the camera manufacturer CamPark specifically says don’t use rechargeable batteries but I use them and the camera is fine with no malfunctions or damage whatsoever and I have been using two cameras since April. I believe other people on this forum have been using rechargeable batteries a lot longer than that.
This is a well known issue and has been brought up several times before in other threads because it is a common warning in camera manuals and I have yet to see anyone mention a damaged camera from using them. I understand your point about why would they say it and can only point you to what Nic said about the difference in voltages potentially meaning they may not be powerful enough to power the camera. I think it you want a definitive answer for your specific camera you would have to contact the manufacturer.
To give you some context my Camparks were £45 (and have been great) so weighing up the potential downsides of using rechargeable batteries was a no-brainer for me but I understand if you’ve spent £250 on a camera you may be more hesitant in going against the manufacturers instructions.
