In case others find this like I have:
Itβs a bug - the only solution that exists today that I know is to shorten the maximum length of tremolo lines for unbeamed notes (Engraving Options β Tremolos β Multi-note Tremolos).
While this fixes the problem in this instance, it is a global property that applies across the file. Be sure to spot-check around both your score and parts to find a value that works in all instances. The default value is β12β but Iβve found a value of β7β is the happy-medium for my current project.
Would love to see Dorico add a setting in this section for an additional accidental offset that would solve this!
Welcome to the forum, @mrmusicman789. I confirm that this is indeed on our backlog to be addressed in future.