cells source code：
src.zip (1.6 KB)
origin cells:
转换工具转换失败附件 (1).xlsx.zip (8.5 KB)
before converted：
image.jpg (260.8 KB)
after converted：
image.png (95.8 KB)
Please have a check.
@hucq_landray_com_cn
By testing with sample files and code on the latest version v24.12, we can reproduce the issue. Found diagonal border loss when converting files to HTML.
We have opened the following new ticket(s) in our internal issue tracking system and will deliver their fixes according to the terms mentioned in Free Support Policies.
Issue ID(s): CELLSJAVA-46227
You can obtain Paid Support Services if you need support on a priority basis, along with the direct access to our Paid Support management team.