regression on grid cell edit - $parse() throws errors

I have recently updated to ui-grid 3.2.1 from 3.1.1. After upgrade I started getting $parse() throwing error while parsing the grid values that was working perfectly fine before upgrade.

When I compared the code I found this change between the versions -

version 3.1.1 - (line 15117 in addAriaLiveRegion function) values.push(currentSelection[i].getIntersectionValueFiltered());

version 3.2.1 - (line 15208 in addAriaLiveregion function) values.push(grid.getCellDisplayValue(currentSelection[i].row, currentSelection[i].col));

If I disable the cellNav feature, the error vanishes. So I thought of filing a regression bug here.