Starnge problem in reading excel saved by Knime in Power BI/Power Query - Knime version 5.3

Good evening,

I have recently migrated to version 5.3 of analytics platform and noticed the following problem, very very strange.

If I save an excel data from Knime, I get an error in power BI when I try to use it as source model. If I enter the excel file manually and simply save it again, the problem do not occur.

I have no explanation for this. I have never experienced this issue before with previous version and I guess it is a bug.

Can someone help me? See below. Thanks in advance.