PDFTextStripper runs out of memory in 2.0.28 but not in 2.0.27 same code

// Groovy 4.0.12
import org.apache.pdfbox.pdmodel.PDDocument
import org.apache.pdfbox.pdmodel.PDPage
import org.apache.pdfbox.text.PDFTextStripperByArea
import java.awt.geom.Rectangle2D

int GRID_WIDTH = 10
int GRID_HEIGHT = 10

PDDocument.load(new File('./test.pdf')).withCloseable { doc ->
    doc.pages.eachWithIndex { PDPage page, int pageIndex ->
        int rows = Math.ceil((page.mediaBox.height as int) /GRID_HEIGHT)
        int columns = Math.ceil((page.mediaBox.width as int) /GRID_WIDTH)
        println "processing page $pageIndex, rows = $rows, columns = $columns"
        def rectangles = [:]
        (0..<rows).each {rowIndex ->
            (0..<columns).each { colIndex ->
                rectangles["${rowIndex * columns + colIndex}"] = new Rectangle2D.Float(colIndex * GRID_WIDTH, rowIndex * GRID_HEIGHT, GRID_WIDTH, GRID_HEIGHT)
            }
        }
        rectangles.each { key, rect ->
            PDFTextStripperByArea textStripper = new PDFTextStripperByArea()
            textStripper.addRegion(key, rect)
            textStripper.extractRegions(page)
        }
    }
}