Pitch in a WAVE instrument is affected weirdly with 9xx commands in a subpattern

This is a weird one and I don't know quite how to describe it but the pitch of a WAVE instrument seems to get messed up with some combinations of 9xx inside a subpattern. This will make more sense when taking a look at the bug uge file: https://drive.google.com/file/d/1jCPJnvlI2GQeWkTeWMGp6hcOkRISer9A/view?usp=drive_link