nether portal with no way back (ver.2)

I'm in an older world & this area got reset for the 1.15 stuff. So I got there with a portal I already had in the nether still. But there was no portal on the overworld side. So, there's the new 1.15 area with no portal even though that's how I got there.

Update: I tried again. I was in the nether, went through the portal & got to the new 1.15 area with no portal on that side at all.