I was about to report this, thankfully I found this thread before creating a new thread. Given Steven's response I now understand why this would be complicated to fix. I might as well share my post before scrapping it though :
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First of all, so this is easier to understand, this is how the track information works: There's a prompt field and a main field. Once a prompt field is set, it works as a sort of indentation for the main field. You can customize the number of rows each line takes and allow for longer tags to wrap around.
Issue #1: The number of rows doesn't always match with the field length. This was brought up a few years ago in this thread:
https://getmusicbee.com/forum/index.php?topic=34118.0Example:

At the time Steven mentioned it wouldn't be fixed due to the complexity of using multiple text formats, which is understandable. I tried to find a workaround by moving everything to the main field, which of course works well without formatting:

When formatting is added it also fixes some instances (but not all of them) of Issue #1:


This leads me to Issue #2, which is why I made this thread: When formatting is applied to the main field, the first piece of formatted text seems to be treated as a prompt, creating an indentation. I'm guessing this isn't the intended behavior of this field, as it's counterintuitive.