[jvzr]

There was concern at one point that the laser component of Starlink woulldn't burn up during atmospheric reentry. I don't think many (if any) satellites currently in orbit have that laser module (which will be used for satellite-to-satellite communication, and IIRC better latency by removing a necessary ground round-trip when the satellite leaves radio "line of sight" with your antenna; I don't have the correct terminology). I don't know either if that's been fixed

[LeoPanthera]

At the moment, only satellites in a polar orbit have the laser module installed, which I believe is a grand total of 13 right now.