Master Page
When setting up multiple 2 page spread master pages, there is an issue with graphics overlapping onto other master pages when 'Facing Pages' is switched on.
For example - Master Page A is blank, and Master Page B has a green box along the top of the page.
When the Master Page A is placed next to a Master Page B, the green box graphic spreads onto Master Page A as well.
Please see the attached screen shots for clearer explanation.
Thanks

We have released InDesign CC2019.0.2 with lot of bug fixes. If you are not on 14.0.2.324 then I would recommend you to upgrade to latest version as it is more robust.
If you still face this issue even after updating, please provide more information to santalwa@adobe.com –
• Reproducible Steps – What were you doing when you encountered the issue in InDesign?
• Error snapshot or video recording of the issue?
• Is(Are) the issue related to a specific document(s)/asset(s)? If Yes, Can you please provide the document(s)/asset(s)?
Adobe InDesign Team
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Philip Byrne commented
I'm seeing the same issue and have been for years up to the latest release (16.3.2). If there is any object that touches the spine on either side of a facing-pages master spread – say, a full-page block of colour or an image box – applying the master to one page of a spread makes all elements that touch the spine on the master appear on both pages.
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Paul Nylander commented
Noticed this is still a problem in Indesign 15.1.1 (June 2020). Even the "move it over by 1 px/pt" trick doesn't solve this problem of backgrounds incorrectly missing when using different master pages on the left or right page of the spread.
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We have released InDesign CC2019.0.2 with lot of bug fixes. If you are not on 14.0.2.324 then I would recommend you to upgrade to latest version as it is more robust.
If you still face this issue even after updating, please provide more information to santalwa@adobe.com –
• Reproducible Steps – What were you doing when you encountered the issue in InDesign?
• Error snapshot or video recording of the issue?
• Is(Are) the issue related to a specific document(s)/asset(s)? If Yes, Can you please provide the document(s)/asset(s)?Adobe InDesign Team
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Ben commented
Furthermore, this also happens when there is no facing page. I.e blank on the left, Master Page B on the right, and the green box graphic still appears on the left.