The bug

The following uses 20w13b Mojang class names

Crash reports which contain the "Ticking connection" section have an unuseful value for the "Connection:" field because the class net.minecraft.network.Connection does not override the method toString() and therefore the crash report shows something like:

- Ticking connection -
 Details:
 Connection: ly@63011c0a

This can currently be seen with the crash reports generated due to MC-177085.

Note: It is probably not a good idea to include the remote address as "Connection:" value since this can be sensitive information and crash reports are often shared publicly.