I’ve made a few more prints on my new bed with PLA, PETG and ABS and they’ve all had good adhesion.
There is no longer any doubt what so ever to me that the first bed was flawed. The fact that Bambu didn’t question anything at all when I wrote my ticket and immediately offered to send a replacement bed, corroborates that, it’s also a pretty clear indication, IMO, that they know very well that they’ve shipped a batch of poor beds with the printers.