When I try to start a server on version 1.13 to 1.16.5 I get the following error during the setup: Building the Minecraft server... Downloading vanilla jar ...

This has been a bug for a long time now - at least a year and a half, probably more. Essentially, when loading into the Nether after starting the client, if certain shaders are loaded, all entities ...

Mojang has released the final 1.14.4 with bug fixes and added features ahead of update 1.15. Find out everything new and changed in the 1.14.4 plus how to download it, here.