Hello
sorry took a little while, but now we have tested it with 3 different players and all 3 characters got stuck in the teleporter even if another character stood next to the teleporter destination.
Edit to make it even more weird: I placed another teleporter like 12 blocks away from the destination point (based on the chunk loader mod it's even the same chunk) and voilà teleportation worked fine. Now I destroyed that new teleporter, but then placed a newer teleporter at the same location like the last new one and it doesn't work anymore...
Is there any requirement (in whatever weird way someone could think of) when placing a teleporter or when using the Transmitter to set up the connection or anything?