This may be around somewhere on the forum but I could not find anything on the matter: I realized that changing a textstyle from normal to bold will alter the line spacing. I have not experienced that in any other software and I believe this to be a bug.
Project TEMPLATE FILE
Project number 000000
If you set this up as a Revit annotation with a line break, the bold version will have a different spacing and the six zeros will not align with the string 'Project number'. I will now make the bold annotation a iota smaller and hope for the best. Eyeballing it as is custom in Revit. I found this to be true using the standard Arial font with the Version 2022.1. It may have been remedied since.
