POE Extraction and port reuse for POE Device
Both the RT9400 and ESP32-POE are Powered Devices (PD).

As standard Ethernet links are point-to-point, the PoE also assumes it is point-to-point link, meaning, one Power Sourcing Equipment (PSE) will connect to one Powered Device (PD). 

It means that two Powered Devices cannot be paralleled.
The detection of a PoE PD happens by setting a certain resistance on the power lines when the PSE tries to identify the resistance. When you parallel two PDs, the combined parallel resistance will be out of limits for detecting a valid device, and the power negotiation will not continue.

What might work is that with power extracted by RT9400 PoE extraction module, you feed a PoE PSE module that re-inserts power for the next device.