The writer comments have now the "format all comments option, which is apparently quite useful. For example you can set a smaller font size on a document where you need to have a LOT of comments cramped in some pages
While the formatting appears to work properly until you are keep working on the file, after saving closing and reopening, the font size you have set is not present, and it appears to be quite unpredictable: in the attached document, after setting all comments to size 9, upon reopening the file you can see that some comments are size 10 and others (a minority) are size 9.
After reapplying the size formatting this time to size 8, and saving, you get a mix of the 3 sizes 10, 9 and 8!
Created attachment 123148 [details]
A witer file with comments of different sizes even though I formatted them all to 8 with the specific command
FWIW I don't think this has anything to do with Format All Comments - I did a test where I formatted them independently, and when I did the format all comments, both had same result.
What I did:
New writer document;
Format first comment to size 40 font (format -> comment)
Format second comment to size 40
Observed: Second comment was back to size 10, first retained formatting.
*** This bug has been marked as a duplicate of bug 91596 ***