VSCode & Delve dap: Can't get the vscode debugger to work when dlv is launched using 'dlv dap'

Question

I'm running VSCode 1.66.0 and I'm trying to attach the golang debugger on a running instance of a specific golang-docker-image. I'm able to do this when using 'dlv' but not when using 'dlv dap' and I can't understand why.

I'm following the instructions provided here:

 https://vscode-debug-specs.github.io/go/#debugging-running-remote-process

Versions used:

• VSCode ver. 1.66.0
• dlv ver. 1.8.2
• Docker Desktop ver. 4.4.4

My launch.json looks like this:

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Attach to Remote Process",
            "type": "go",
            "request": "attach",
            "mode": "remote",
            "port": 2345,
            "host": "127.0.0.1",
            "showLog": true,
            "apiVersion": 2,
            "dlvLoadConfig": {
                "followPointers": true,
                "maxVariableRecurse": 1,
                "maxStringLen": 200,
                "maxArrayValues": 64,
                "maxStructFields": -1
            }
        }
    ]
}

My dockerfile looks like so (as you can see the resulting image is based on the official image "mcr.microsoft.com/vscode/devcontainers/go:0-1.18"):

 # syntax=docker/dockerfile:experimental
 FROM golang:1.18 as builder
 [...]
 RUN CGO_ENABLED=0 GOOS=linux GOARCH=$ARCH go build -gcflags "all=-N -l" -v -o main .

 
 FROM mcr.microsoft.com/vscode/devcontainers/go:0-1.18
 
 WORKDIR /app
 
 CMD ["./main"]

The command I use to launch the 'dlv' process inside the running docker instance is this:

dlv dap --listen=:2345 --log=true --api-version=2 attach 1 ./app/main

The VSCode UI allegedly allows me to attach via:

> Debug: Select and Start Debugging -> Attach to Remote Process

However the debugger doesn't really get activated in the sense that the breakpoints are not honored and the 'dlv' command shown above doesn't print anything in the output.

If I remove the 'dap' part from the 'dlv' command:

dlv --listen=:2345   --log=true    --headless=true     --log-output=debugger,debuglineerr,gdbwire,lldbout,rpc      --api-version=2   --accept-multiclient   --headless  attach  1   ./app/main       

then the debugger attaches perfectly and works just fine (this is the legacy mode of the dlv debugger if I understand correctly). What gives? Am I missing something?