Steps to Reproduce

1. load the attached file with 5.1.0.FL.20200215-Eval

    <spreadsheet id="ss" height="100%" width="100%" src="/WEB-INF/books/t10863.xlsx"
                 maxVisibleRows="150" maxVisibleColumns="40" showContextMenu="true"
                 showToolbar="true" showSheetbar="true" showSheetTabContextMenu="true" showFormulabar="true"/>

2. select the 2nd sheet

Current Result

the 2nd sheet doesn't show up, keikai still shows the first sheet

Expected Result

the 2nd sheet shows

Debug Information

• 5.0.0 doesn't have such issue
• After step 2, if I select the 1st sheet again and select the 2nd sheet, the 2nd sheet just shows this time.