Using Windows 7 or Mac OS no matter even it's in preview Indesign CC.

I found this and very annoying to fix it manually in master page items.

Steps Created Master Page A for body text pages
Created master Page B: As a chapter opener. It's based on Master A. Only removed top running header.

Now applied in pages:
Left side page : Master Page A.
Right side page chapter opener and applied Master Page B

Result: Part of Running Header is disappear in Left Side Page, right side page ok as is.

Am I missing something. Getting this kind of result from previous version of Indesign CC

PS: When I removed based on features. Everything is ok. Even If item is within page, then also it's ok. If the items is touching the page edge or bleeding then it disappears.

After further investigating, came to this conclusion: it only happens if used based on features in master pages and after removing editing header part. Effects on the item that bleeds. in this case Master page A.

Refer the attachment for details.