BZFlag has reached 2.0.0. This is a major update, as network gameplay with prior versions is incompatible, but given all the improvements, it's definitely worth having in FC4. Attached is a patch to the current FC Development spec file. See the few comments in the %changelog for details about the changes. It may also worth doing a quick check to see if this update may fix #139832 by any chance.
Created attachment 110054 [details] Patch to update to 2.0.0.
The problem is that bzflag2 and bzflag1 are not fully compatible and at the moment quite a few of the major servers are still bzflag1. I agree with Matthias I think because by FC4 release everyone will be using bzflag2