This is the ticket that documents what has been done and why:

https://github.com/Maproom/qmapshack/issues/285

And this is the PR

https://github.com/Maproom/qmapshack/pull/292

Hashes always have the same length. You can calculate the MD5 hash over the 
first 4096 bytes of your map files yourself. There is no other magic involved.

> Gesendet: Samstag, 18. September 2021 um 01:00 Uhr
> Von: "Michael Heerdegen" <[email protected]>
> An: "Oliver Eichler" <[email protected]>
> Cc: "QMapShack MailingList" <[email protected]>
> Betreff: Re: [Qlandkartegt-users] Views and qms upgrades
>
> Oliver Eichler <[email protected]> writes:
>
> > Hi,
> >
> > yes this is expected. The number of bytes used to calculate the hash
> > was in creased.
>
> Ok.  I will probably update the views by performing query-replace in the
> save files.
>
> Useful information for doing that if you don't mind would be: Is there
> an easy way to calculate the hash?  Is the old hash a prefix or suffix
> of the new one?  IIUC you just hash more bytes of the map file (?) so
> the hashes have the same lengths as before and the answer to the second
> question is "no".
>
> TIA,
>
> Michael.
>


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