I have a paperspigot 1.12.2 with latest viarewind, viaversion, viabackard under Waterfall.
The server is creative mode and use plotsqured with plots.
The plotsquared plugin have a feature if player try to "steal" heads or banner, it will be replaced with regular heads/banner.
I never have this issue using protocolsupport, instead using viarewind and any client, it cause the player to disconect if he try to "steal" (like the server was offline).

I dont have any logs, on console, it just disconect message.

If this happens on any client this is not caused by ViaRewind.

so viaversion bug?

If it is happening with every version (even 1.12.2) this will not be related to any protocol hack plugin.

i just upgraded to viaversion/viarewind from protocolsupport and this happening

Is it happening with 1.12.2 clients?

yes with all clients

then it is not related to any protocol hack

I confirm that using protocolsupport it don't crash the client and working correct, it can be a plotsquared issue?

I opened the issue here IntellectualSites/PlotSquared#1888