[FFmpeg-trac] #11442(undetermined:new): Scale followed by vstack stopped working

[FFmpeg]

#11442: Scale followed by vstack stopped working
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             Reporter:  Marth64      |                    Owner:  (none)
                 Type:  defect       |                   Status:  new
             Priority:  normal       |                Component:
                                     |  undetermined
              Version:  unspecified  |               Resolution:
             Keywords:               |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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Comment (by Marth64):

 Hi, appears to always be impacting PNG files screenshots taken from macOS
 (but hit or miss with other PNG sources).

 Attached a sample.
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Ticket URL: <https://trac.ffmpeg.org/ticket/11442#comment:2>
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