I think you need to use the mdb_dump tool to dump the contents of the database and then investigate the contents either with a text/hex editor or with mdb_load
it ended up being some legacy code left behind to monitor corruption during boot 
after quite some troubleshooting we found it and removed so the “issue” is gone. Thank you all.
It didn’t seem very easy through our yocto build system, so I didn’t try your suggestion after all.
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