I made a 1.12.2 modded pvp server for me and my friends with this mod and others, and the fluid and item teleport pipes are so buggy they are not even worth using at this point.

I have 4 lava pumps in the nether pumping out the lava lakes into teleport pipes that link to another teleport pipe in my base.
the output pipe in my base will randomly turn itself off, and the only way to turn it back on is to click the "input only" "Output-only" etc button a bunch of times (1 loop around the selections seems to do the trick). but the pumps will keep pumping and the liquid that should have gone to the output pipe in my base when it was "turned off" seems to have been deleted
The same thing happens with my teleport pipes from my quarry to my base.

Is anyone else having this issue or know a better way to work around it?

yea i have the same problem, using latest version of magma core, single player works fine. core version is efb9116e