Running bitcoin core with tor proxy

I'm running bitcoin core with the following configuration:

prune=0
txindex=0
onion=127.0.0.1:9050
onlynet=onion
proxy=127.0.0.1:9050
proxyrandomize=1
server=1

When I run electrs to perform the initial sync it closes with the following error:

Error: electrs failed

Caused by:
    0: bitcoin p2p failed to connect: 127.0.0.1:8333
    1: Connection refused (os error 111)

If I comment out the proxy related lines in the bitcoin core configuration file then electrs starts the initial sync as expected, but I would like to run bitcoin core with the tor proxy.

Can someone help me with this issue?