I tried fresh gdb 14 from
https://github.com//ssbssaI configured it as "gdb14-64" (see attach 1 ) and assigned it to the toolchain (see attach 1), replacing native gdb form this toolchain, "nix64" (see attach 1).
However, old "nix64" gdb is jumping out when I`m trying to debug (see attach 1). In default.conf all looks ok (attach 2), when I hacked "nix64" profile to use ssbssa gdb, it worked. Looks like somewhere in depth of the C::B old profile, "nix64", is not replaced with new one "gdb14-64".
"So it goes" (с)
Update: Problem was resolved according to
https://forums.codeblocks.org/index.php/topic,22724.msg154381.html#msg154381 recommendation. Somehow "nix64" was assigned as "active debugger"