[myank] Rhythm change when extracting measure

[craigsapp]

When extracting measures 100-110 of this score:

https://polishscores.org/?id=pl-wn--mus-iii-86-055

https://verovio.humdrum.org/?file=https%3A%2F%2Fhumdrum.nifc.pl%2Fpl-wn--mus-iii-86-055.krn

There is a problem in measure 107:

When in the full score:

After running myank:

The quarter notes are being turned into longs.