V12. Set sale.report_saleorder template report type to HTML. Edit web.external_layout_standard XML template then go to sales->quotations->print to check the effect, first several rounds looks good,  I can print out html type quotation which reflecting my template changes. After doing this for several times the html type quotation stop to reflect my changes. Checked 'Non-updatable' attribute of external_layout_standard's Model Data, it is unchecked.

 Then changed sale.report_saleorder template report type to PDF, sales->quotations->print will creat PDF type quotation which can reflect my changes. Does anybody have the same experience? Is this a bug?

Thx