Assignment of new value in debugger doesn't work anymore

We used to assign new values for integer variables during debugging sessions with gdb. This works as expected with at least version 3.4.1

After switching to version 3.6.0, this doesn't work anymore.

The Debugger log shows (left hand):
323assignValue
16:29:42.007
— token barrier —
16:29:42.093
16:29:42.093
16:29:42.097 [3ms]

and the response is (right hand side).
323assignValue

t16:29:42.007 [177ms]
>&"assignValue\n"
t16:29:42.007
>&"Undefined command: \"assignValue\". Try \"help\".\n"
t16:29:42.007
>323^error,msg="Undefined command: \"assignValue\". Try \"help\"."
t16:29:42.007