Comments field is behaving weirdly for me in the beta. The <br> tags in comments are getting duplicated on all book records.
The following is from the exact same library. Note, I don't actually have a new line character [\n] in the Calibre library comments. Just added it here for readability.
Calibre Portable 3.40.1 (Windows 7 x86 and x86-64)
Code:
<p class="description">Published: 2016-10-31 Updated: 2019-02-03 Chapters: 71/? Words: 171444
<br>
<br><b>Summary</b>
<br>"But you, Lord Snow, you'll be fighting their battles forever." Ser Alliser Thorne
<br>
<br>Every time he died his last in that life he awoke again in another at the exact moment of Ghost's birth.</p>
Calibre Portable 3.40.3 (Windows 7 x86 and x86-64)
Code:
<p class="description">Published: 2016-10-31 Updated: 2019-02-03 Chapters: 71/? Words: 171444
<br>
<br>
<br>
<br><b>Summary</b>
<br>
<br>"But you, Lord Snow, you'll be fighting their battles forever." Ser Alliser Thorne
<br>
<br>
<br>
<br>Every time he died his last in that life he awoke again in another at the exact moment of Ghost's birth.</p>