According to the spec, the number of digits after the E in scientific notation gives the minimum exponent digit count. I would expect that if textNumberCheckPolicy is strict, then data that provides a number of digits less than this minimum should fail. However the data parses without issue.

see test
textNumberPattern_scientificNotation02 in the following files:
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section13/text_number_props/TextNumberProps.tdml
daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section13/text_number_props/TestTextNumberPropsDebug.scala