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After you’ve generated graph by,
const canvasmixedBarLine: any = document.getElementById('mixedBarLine');
const ctxmixedBarLine: any = canvasmixedBarLine.getContext('2d');
const mixedBarLine = new Chart(ctxmixedBarLine, {});
try putting this line after that:
ctxmixedBarLine.globalCompositeOperation = 'destination-over';
Source:stackexchange.com