Odata - incorrect count with query option $count=true

HTTP: GET http://localhost:8080/odata4/olingo_basic/Source/SimpleTableView?$count=true&$filter=intkey lt 5
Header: Prefer: odata.maxpagesize=2
Actual result: <m:count>3</m:count>
Expected result: <m:count>4</m:count>
Additional note: Teiid returns 2 entities.
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HTTP: GET http://localhost:8080/odata4/olingo_basic/Source/SimpleTableView?$count=true
Header: Prefer: odata.maxpagesize=10
Actual result: <m:count>10</m:count>
Expected result: <m:count>11</m:count>
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Moreover, when I invoke another request for next results (including skiptoken), Teiid returns different count.
HTTP: GET http://localhost:8080/odata4/olingo_basic/Source/SimpleTableView?$count=true&$skiptoken=GBRvEm+OcCFn--10
Actual result: <m:count>1</m:count>
Expected result: <m:count>11</m:count>
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HTTP: GET http://localhost:8080/odata4/olingo_basic/Source/SimpleTableView?$count=true&$top=5
Actual result: <m:count>10</m:count>
Expected result: <m:count>11</m:count>
Additional note: Teiid returns 5 entities.