I've made progress in that there are two SOCKS5 options in the settings, the second option creates a separate SOCKS5 connection, and still allows IPv4/6 incoming.
By "in the settings", do you actually mean option on Bitcoin Core GUI (see below image)?
Source: https://bitcoin.stackexchange.com/questions/52906/unable-to-connect-to-peers-nor-synchronize-the-network
However, does this allows for incoming Tor connections?
IIRC "Use seperate SOCKS5 proxy ..." equal to onion=... And based on what guide i mentioned earlier, the answer is no since onion service isn't created yet (either manual or automatic).
But also, is it a security issue for those connecting on Tor if am also connecting to IPv4/6?
AFAIK no, although anonymity concern exist where theoretically it's possible to know node with IP X and node with onion link Y actually belong to same node.
