keys setting overridden by fluxbox-update_configs

My `~/.fluxbox/keys` file contains the following lines:

[...]
OnTitlebar Double Mouse1 :Maximize
[...]


However, it seems that fluxbox on startup and on exit, will prepend a
few lines of configs, including below lines, to the beginning of my
keys file:

!mouse actions added by fluxbox-update_configs
OnTitlebar Double Mouse1 :Shade


This essentially overwrite my setting. I have no idea what triggered
fluxbox-update_configs. And there's no mention of this tool in the
manpage.

Is there a way I can disable auto config saving?


---

Fluxbox version: 1.3.7
GIT Revision: unknown
Compiled: Apr  7 2022 11:27:03
Compiler: CLANG
Compiler version: FreeBSD Clang 11.0.1
([email protected]:llvm/llvm-project.git llvmorg-11.0.1-0-g43ff75f2c3fe)

Defaults:
menu: /usr/local/share/fluxbox/menu
windowmenu: /usr/local/share/fluxbox/windowmenu
style: /usr/local/share/fluxbox/styles/bloe
keys: /usr/local/share/fluxbox/keys
init: /usr/local/share/fluxbox/init
nls: /usr/local/share/fluxbox/nls

Compiled options (- => disabled):
BIDI
-DEBUG
EWMH
-IMLIB2
NLS
REMEMBER
RENDER
SHAPE
SLIT
SYSTEMTRAY
TOOLBAR
RANDR
XFT
XINERAMA
XMB
XPM