Math formulas are frames anchored as characters and it is a good thing because they are just characters with a dedicated set of typesetting rules. However, there is a drawback from at least 2 standpoints
1) when a math formula ends a phrase, the line breaking mechanism allows the dot to be separated from the math character just before, sometimes creating an orphan dot.
2) There is a smart feature that automatically capitalize the first word of a new sentence. Unfortunately, when the phrase starts with a math formula, it capitalizes the second word of the phrase, which is annoying.
There is a simple workaround for point 2) but not for point 1) which is really a bad thing.
Request : let the line breaking and the capitalizing mechanisms consider frames anchored as characters as real characters.
Yes, that is a problem, for a long time.
*** This bug has been marked as a duplicate of bug 65323 ***