Metadata not found when it contains 0.000000 in its bounding box definition

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We use the xml.search to find metadata which match our criteria. The parameters of the search bounding box and the keyword are sent to geonetwork which returns a list of matched metadata.

We noticed that some records were never found, no matter how we drew the search bounding box. The bounding box of the metadata looked fine (bounding box over a part of west europe), we also examined it in the metadata viewer in geonetwork.

It appeared these records which were not found, all contained a 0.000000 as value for the westbound longitude. After changing this to 0.0000001, the records were found.