Dimension text obscures lines

Is this a feature, or a bug?

there appears to be a filled text box behind the text which is obscuring part of the dimension line “tick”.
At best it’s unattractive, but at worst it can be a bit confusing on the page.

I suppose a text box (background fill on text) may be useful or necessary, but im unsure why it needs to be so large.

This is on 21.1.279