Created attachment 72858 [details]
Table with border lines that are ignored.
Border lines defined for table cells not shown neither in preview nor printed doc.
I can confirm this with Version 18.104.22.168 (Build ID: a67943cd4d125208f4ea7fa29439551825cfb39) @Win7x64
In 22.214.171.124 I can reproduce the issue.
In 126.96.36.199 the preview has border lines now, but printed output is still missing them.
In current 4.3 dev build (linux), both the preview and printed output have border lines.
So it appears to be fixed.