Convert to entity script causes Unity to crash?

When I put a ConvertToEntity script on a GameObject Unity crashes. Also, before this I was getting burst compiler errors whenever I tried to enter playmode, but when I restart Unity these errors disappear.

For the crash, please report a bug with Help->Report a bug (or ideally when unity crashes the crash handler should ask you to report it). We really do look at those, and they help us a) figure out how crashy each version of unity is (so how worried we should be) and b) also help us track down the particular crashes.

For the burst errors, if you just upgraded burst, for now you need to restart the editor to avoid errors. We’re working on making that not required anymore.