Items are lost after a merge

[malyv]

Describe the bug

After merge there are many entries missing in db. I use Syncthing to transfer master copy of db to prevent data lost. Then I manually make a local copy of db for KeePassDX.

To Reproduce

Steps to reproduce the behavior:

1. Make 2 identical db's, master and local
2. Open local db, Click on 'Merge from', select master db
3. After merge there are a lot of missing items, e.g. all 27 items from one group are missing

Expected behavior

After the merge there should be more or at least as many items as before the merge

KeePass Database

• Created with: Created in old version of KeePass, then opened in KeePassXC 2.7.4 and transform to version 4 (I believe, I don't see database version in KeePassXC)
• Version: V2 - KDBX 4.1 (visible in KeePassDX)
• Location: local file opened by Cx File Explorer
• File provider content://com.cxinventor.file.explorer.fileprovider/root/storage/emulated/0/Documents/KeePassLocal/NewDb.local
• Size: 185 KB, aprox. 560 entries
• Contains attachment: yes

KeePassDX:

• Version: 3.5.0
• Build: Free
• Language: [e.g. English]

Android:

• Device: Xiaomi Redmi 6
• Version: Android 9

Additional context If I do the same in KeePassXC, there are no entries lost.

[J-Jamet]

I can't reproduce the problem, please upload two test databases with a reproducible procedure so I can identify where the problem is coming from.

[malyv]

I found that the error is somehow related to the deleted entries in the database. This does not happen with a newly established database.

In the original KeePass, under maintenance, I run delete for 'deleted objects information'. If I open 'db after maintenance' in mobile in KeePassDX and start merge with 'copy of db after maintenance' everything is OK.

But if I open 'db after maintenance' on mobile in KeePassDX and run merge with 'db before maintenance' -> all items are lost (except two recently added ones).

I prepared a test database for you by manually deleting items from 'db before maintenance' and leaving about 6 unimportant ones, deleted the trash, changed the master password, it is still about 24kB in size.

However, I still don't know if it's safe to send the modified database like this, since there are probably some remnants of deleted items and I don't know if they also contain sensitive data. If you say it's safe for me, please let me know where I can send the test database and password (preferably not a public place).

[J-Jamet]

I don't recommend using your own database for testing even if you delete all the data. But it already tells us that if it is a new database, there is no problem, so there is probably a specificity in your own database.

I can't remember the data modified by the "deleted objects information" parameter, so I'll have to study the issue.