Tried forge versions 28.0.49 & 45. No mods loaded, no datapacks.
Single player forge 28.0.49 tested ok.
New vanilla server tested ok.
debug.log: https://gist.github.com/wh0isit/e47f28cab811b8650e7452806ce3a3fa
crash log: https://pastebin.com/iCtE4rvi
edit: added complete debug.log