Bug saving tiff as PNG

[colinmac]

Using imageMagick 7.0.8 Q16 on Windows 10

running command line

convert image.tif image.png

on this image results in only one third of the image being converted

if I run

convert image.tif image.jpg

its fine
If I then run
convert image.jpg image.png
the png is fine

the image can be found at http://www.mackenziesolutions.co.uk/upl ... /image.tif

[magick]

Try 'convert image.tif -alpha off image.png'.

[colinmac]

Thanls that fixes that image.

Only trouble is I have a few thousand like it (this is the only once so far that has been spotted as broken) and I am a bit iconcenred what this will do to the others.
Is it a "sage" thing to do?