Bulk actions on custom posts type automatically delete metadata

[vitolioce]

Hello,
I would to point out a bug that I found on one of my sites made with WordPress.
The site in question is www.weekendinliguria.it, based on WordPress, in which I have included two types of custom posts type (CPT) to which I have assigned some special data as metadata.
As my client pointed out, I noticed that the metadata assigned to the CPT are automatically deleted. Eliminated the human cause, and any poorly written code by me, I found that when I go to a group action on CPT metadata are regularly cleared for all CPT of that type. The construction of the CPT was made according to the rules explained by the relevant article in the WordPress Codex. I also noticed that this problem does not occur on group actions of articles and pages.
I hope to be useful in reporting this bug, and I remain at your disposal to correct it as soon as possible.

[SergeyBiryukov]

1. What do you mean by action groups?
2. Does it still happen with all plugins disabled and a default theme (Twenty Fourteen or Twenty Thirteen) activated?

[azaozz]

In 29770:

Fix tapping on the menu in iOS and Android, fixes #29365 for trunk

[azaozz]

Ops, closed the wrong ticket, meant to close #29356.

[vitolioce]

Replying to SergeyBiryukov:

1. What do you mean by action groups?
2. Does it still happen with all plugins disabled and a default theme (Twenty Fourteen or Twenty Thirteen) activated?

1: I mean group actions (or bulk actions) in the post section.
2: Yes, I have disabled every plugin and set a default theme

[helen]

I can't reproduce. Could you provide the steps you're using to add metadata and quick edit, and if there is any code involved in adding/saving fields, provide that as well?

[wonderboymusic]

No reporter feedback in 7 months, not reproducible