CAN bus expander circuit
The TJA1050 CAN PHY can't be used to make a passive CAN hub/repeater.
If any device starts to pull the TXD is low to transmit dominant state on the CAN bus, the receiver is still active as it can monitor for collisions so it will soon after pull RXD low, which in turn will keep your TXD low and so the state latches low. At some point the PHY transmit timeout will activate and maybe release the RXD high. But you have three chips with all RXDs being able to drive the TXDs.
Most likely need an MCU with three CAN controllers to handle three CAN bus segments, and a microcontroller to forward messages between them.