Bug? Uneven line spacing inside BBCodeView paragraph (No Bug - My Error)

In the image below the A line spacing is only 80% of the B spacing.
There are no line breaks in the paragraph. The settings are shown below.
I have attached a small project.

It happens at other times, somehow related to fontsize, width, and the letters in the line.
I suspect that this is not a bug, but just my misunderstanding of MinGapBetweenLines.

I searched and good lord I already brought this up before! My apologies. That was only 2.5 years ago


My own solution based on @Erel explanation works perfectly.