Have to step twice when when the debugger is stopped at a breakpoint.

[tdaprogrammer]

When the debugger is stopped at a certain breakpoint, you have to step twice to step the current instruction. Testing other debuggers such local windows debugger, this behavior does not occur.
I have used the following script in IDA to test the behaviour, similar to what can be found in
ida_installation_folder/python3/examples/debugging/dbghooks/automatic_steps.py

"""
summary: programmatically drive a debugging session

description:
  Start a debugging session, step through the first five
  instructions. Each instruction is disassembled after
  execution.
"""

from __future__ import print_function

import ida_dbg
import ida_ida
import ida_lines

line = 1

class MyDbgHook(ida_dbg.DBG_Hooks):
    """ Own debug hook class that implementd the callback functions """

    def __init__(self):
        ida_dbg.DBG_Hooks.__init__(self) # important
        self.steps = 0

    def log(self, msg):
        print(">>> %s" % msg)

    def dbg_process_start(self, pid, tid, ea, name, base, size):
        self.log("Process started, pid=%d tid=%d name=%s" % (pid, tid, name))

    def dbg_process_exit(self, pid, tid, ea, code):
        self.log("Process exited pid=%d tid=%d ea=0x%x code=%d" % (pid, tid, ea, code))

    def dbg_library_unload(self, pid, tid, ea, info):
        self.log("Library unloaded: pid=%d tid=%d ea=0x%x info=%s" % (pid, tid, ea, info))

    def dbg_process_attach(self, pid, tid, ea, name, base, size):
        self.log("Process attach pid=%d tid=%d ea=0x%x name=%s base=%x size=%x" % (pid, tid, ea, name, base, size))

    def dbg_process_detach(self, pid, tid, ea):
        self.log("Process detached, pid=%d tid=%d ea=0x%x" % (pid, tid, ea))

    def dbg_library_load(self, pid, tid, ea, name, base, size):
        self.log("Library loaded: pid=%d tid=%d name=%s base=%x" % (pid, tid, name, base))

    def dbg_bpt(self, tid, ea):
        self.log("Break point at 0x%x pid=%d" % (ea, tid))
        # return values:
        #   -1 - to display a breakpoint warning dialog
        #        if the process is suspended.
        #    0 - to never display a breakpoint warning dialog.
        #    1 - to always display a breakpoint warning dialog.
        return 0

    def dbg_suspend_process(self):
        self.log("Process suspended")

    def dbg_exception(self, pid, tid, ea, exc_code, exc_can_cont, exc_ea, exc_info):
        self.log("Exception: pid=%d tid=%d ea=0x%x exc_code=0x%x can_continue=%d exc_ea=0x%x exc_info=%s" % (
            pid, tid, ea, exc_code & ida_idaapi.BADADDR, exc_can_cont, exc_ea, exc_info))
        # return values:
        #   -1 - to display an exception warning dialog
        #        if the process is suspended.
        #   0  - to never display an exception warning dialog.
        #   1  - to always display an exception warning dialog.
        return 0

    def dbg_trace(self, tid, ea):
        self.log("Trace tid=%d ea=0x%x" % (tid, ea))
        # return values:
        #   1  - do not log this trace event;
        #   0  - log it
        return 0

    def dbg_step_into(self):
        self.log("Step into")

    def dbg_run_to(self, pid, tid=0, ea=0):
        self.log("Runto: tid=%d, ea=%x" % (tid, ea))

    def dbg_step_over(self):
        global line
        self.log("step over "+str(line))
        line += 1


# Remove an existing debug hook
try:
    if debughook:
        print("Removing previous hook ...")
        debughook.unhook()
except:
    pass

# Install the debug hook
debughook = MyDbgHook()
debughook.hook()