Here is a list that will be updated with commands that don't work at either warp hostile, nether or both for seemingly no reasion /visit __ /daily /shops find owned/shops find wanted /mail /trash (especially annoying since you can't drop items at warp hostile /sit /disguise (yet you can use a disguise and enter a portal) /local and /global (annoying if you enter in local and can't switch) /PM (credit 0cultado) And more, please comment them so I can update this list
No support. Bring with you what you need to the nether. It keeps it challenging rather than just buying new tools and food etc. It's a public warp so ig that's why. Generally hacks arent allowed in public warps, including some player rank perks like disguises.. Being disguised as a nether mob could lead to trolling/griefing players in the nether. So No Support to these two, although I support the rest. Chat modes being changeable and /visit though you can do /is so it makes sense for visit too.