Drawbox filter does not display over transparent backgrounds

[ScriptTiger]

This bug is reproducible on all versions later than 3.4.2.

I have the following complex filtergraph stored in a file (filtergraph.txt):

color=

00000000:
1280x720:
sar=1,

trim=

end_frame=1,

format=

rgba,

drawbox=

0:
175:
640:
375:
545454:
15,

drawbox=

640:
175:
640:
375:
545454:
15,

drawbox=

0:
585:
345:
60:
545454:
fill,

drawbox=

935:
585:
345:
60:
545454:
fill,

drawtext=

fontsize=70:
fontcolor=blue:
text='Test':
x=490-(text_w/2):
y=60-(text_h/2),

drawtext=

fontsize=70:
fontcolor=red:
text='Overlay':
x=715-(text_w/2):
y=60-(text_h/2),

drawtext=

fontsize=30:
fontcolor=white:
text='Subtitle':
x=640-(text_w/2):
y=120-(text_h/2),

drawtext=

fontsize=31.5:
fontcolor=green:
text='Host':
x=1100-(text_w/2):
y=620-(text_h/2)

[overlay]

I then issue the following command:

ffmpeg -filter_complex filtergraph.txt -map "[overlay]" overlay.png

In ffmpeg versions 3.4.2 and earlier the png comes out as expected, with some drawboxes and text over a transparent background. However, in versions later than 3.4.2 there are absolutely no drawboxes present in the resultant png but the drawtext comes out fine.

The build information for the latest version that DOES NOT have this problem is as follows:

ffmpeg version 3.4.2 Copyright (c) 2000-2018 the FFmpeg developers

built with gcc 7.3.0 (GCC)
configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libmfx --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth
libavutil 55. 78.100 / 55. 78.100
libavcodec 57.107.100 / 57.107.100
libavformat 57. 83.100 / 57. 83.100
libavdevice 57. 10.100 / 57. 10.100
libavfilter 6.107.100 / 6.107.100
libswscale 4. 8.100 / 4. 8.100
libswresample 2. 9.100 / 2. 9.100
libpostproc 54. 7.100 / 54. 7.100

Hyper fast Audio and Video encoder
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...

All other versions after that all experience the same issue.

[ScriptTiger]

I don't know if this has to be said, but obviously the drawbox "fill" is actually "max" in 3.4.2 and earlier. So the filtergraph is slightly different depending on what version you run it on, but only different by way of that single difference.

EDIT:

I also just realized I made a typo in the command when I typed it in the above ticket. It should be "-filter_complex_script", not "-filter_complex". Everything else holds true.

[Elon Musk]

Did you tried replace option?

[ScriptTiger]

Thank you, @richardpl, that did it. The "replace" option is new since 3.4.2 and I must have missed it. Shouldn't the default for "replace" be "1" for both backwards compatibility reasons and the fact that most people that use the drawbox filter will probably want to actually see the drawbox?

Anyway, sorry for the newb question. Closed!