Please mark the mod as client only via
https://mcforge.readthedocs.io/en/latest/concepts/sides/#writing-one-sided-mods

right now it will cause a red X in the server list if the mod is missing on the server, thanks!

Which version is this? I added the line for 1.16+ in June

sorry, the 1.15 version, the change is on Github but never saw a release on CF

1.2.0 out now and backported to 1.15.2 as well. Enjoy!

thanks!

Also requesting it be re-opened.

This is still an issue in Ding-1.6.1-1.2.0. Can this be re-opened?