Try to add widget to specific page layouts, but in admin panel no page layouts list is empty

Hello, @gizmocn. Based on Your issue an internal ticket was created - MAGETWO-70278. You'll be informed after the issue is resolved. Thank's for applying.
@gizmocn, thank you for your report.
We've created internal ticket(s) MAGETWO-70278 to track progress on the issue.
I bumped into this issue as well. However, it seems that simply none of the Page Layouts (like 1column.xml) have been added to this widget selection box because of reasons. I created a sample module (as part of a training during which this was raised as a question) that demonstrates the right code: https://github.com/yireo-training/magento2-example-custom-page-layout For reference, I'm also including a question that Alan Storm raised on this, which got me on the right way: https://magento.stackexchange.com/questions/102467/what-is-a-magento-2-design-abstraction
In short, a regular layout file (layout/example.xml) always starts with a page node that could now include a label (label="My example") and a design_abstraction="page_layout". In the current system, all of the layouts mentioned under the widget selection box discussed here, have set design_abstraction="custom". By changing custom into page_layout, layouts also appear in the Page Layout option group in the selection box.
However, the terminology leads me to think something is off. It would make sense if the custom value refers to handles within the regular layout and the page_layout value refers to handles within the page layout (like 1column). Unfortunately, the whole design_abstraction attribute is not allowed to be used in a page layout file, because it is not included in its XSD. As a workaround, in my example module, I've simply included the page layout in the regular layout, which works as well.
Hello everyone! Any status update on this?
Also please note that when adding a custom cms page in magento 2.2.5 that custom cms does not get displayed in widget layout update for specified pages. Page type does not get updated at all. This should be native functionallity tbh to add widgets to any page you want even if it is a newly made CMS page without manually updating the page_types.xml in your own module.
Steps to repilcate:
I noticed you are manually adding types in vendor/magento/module-cms/etc/frontend/page_types.xml.
Are we missing something here?
Hi @sdzhepa. Thank you for working on this issue.
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Same issue. Subscribing for an update.
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:white_check_mark: Confirmed by @engcom-Golf
 Thank you for verifying the issue. Based on the provided information internal tickets MC-31869 were created
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Hi everyone! Any update on this?
Most helpful comment
Hello everyone! Any status update on this?
Also please note that when adding a custom cms page in magento 2.2.5 that custom cms does not get displayed in widget layout update for specified pages. Page type does not get updated at all. This should be native functionallity tbh to add widgets to any page you want even if it is a newly made CMS page without manually updating the page_types.xml in your own module.
Steps to repilcate:
I noticed you are manually adding types in vendor/magento/module-cms/etc/frontend/page_types.xml.
Are we missing something here?