cortex-debug: JLink: Remote doesn't know how to detach (from interpreter-exec console "detach")

I have a need identical #445 (embedded developer need to flash program often but not always single step debugging).

cortex debug v1.6.6 I use latest jflash 7.80d GDB from GNU Arm Embedded Toolchain 10.3-2021.10

my launch.json:

        {
            "type": "cortex-debug",
            "request": "launch",
            "servertype": "jlink",
            "cwd": "${workspaceRoot}",
            // https://vector-of-bool.github.io/docs/vscode-cmake-tools/debugging.html
            "executable": "${command:cmake.launchTargetPath}",
            "name": "Flash program (J-Link)",
            "device": "STM32U575QI",
            "interface": "swd",
            "serverArgs": [
            ],
            "ipAddress": null,
            "serialNumber": null,
            "postLaunchCommands": [
                "monitor reset",
                "monitor go",
                "detach",
            ],
            "showDevDebugOutput": true,
        },

the output:

-> 13^done
14-interpreter-exec console "monitor reset"
-> @"Resetting target\r\n"
Resetting target
-> 14^done
15-interpreter-exec console "monitor go"
-> 15^done
16-interpreter-exec console "detach"
-> ~"Detaching from program: C:\\FW.axf, Remote target\n"
Detaching from program: C:\FW.axf, Remote target
-> &"Remote doesn't know how to detach\n"
Remote doesn't know how to detach
-> 16^error,msg="Remote doesn't know how to detach"
Failed to launch GDB: Remote doesn't know how to detach (from interpreter-exec console "detach")

This is the end of jlink log file. It seems “detach” doesn’t go down to jlink. Problem must be in GDB

00-00000824-00-00004386-000E: $qRcmd,676f#2c
03-00000000-00-00004386-001D: Received monitor command: go

03-00000000-00-00004386-0017: Starting target CPU...

02-00000000-00-00004386-0022: T1344 004:389.720 JLINK_IsHalted()
02-00000000-00-00004386-0028: T1344 004:389.747 - 0.028ms returns TRUE
02-00000000-00-00004386-003D: T1344 004:389.775 JLINK_GoEx(MaxEmulInsts = -1, Flags = 0x00)
02-00000000-00-00004386-0035: T1344 004:389.808   CPU_ReadMem(4 bytes @ 0xE0001000)
02-00000000-00-00004387-0036: T1344 004:390.131   CPU_WriteMem(4 bytes @ 0xE0001004)
02-00000000-00-00004387-001B: T1344 004:390.717 - 0.943ms
01-00000824-00-00004387-0006: $OK#9a
00-00000824-00-00004401-0005: $D#44
01-00000824-00-00004401-0004: $#00

“Disconnect” instead of “detach” works but from what I read here disconnect will not let the target run.

I want to be able to flash my target and if possible avoid to do a manual reset (power on or external) to effectively run the program. Can you help me out ?