I wrote an unparser test case for the scenario when an escapeChar is the same as the separator. This test behaves as expected. However, the parser equivalent does not.

Input:

test#double te##st

I would expect the first # to separate the two elements. The second would escape the third, resulting in:

<e1>test</e1>

<e2>double te#st</e2>

However, the result is the following:

<e1>test</e1>

<e2>double te</e2>

See test parseDelimitedEscapedString05
in the following files:
daffodil-test/src/test/resources/edu/illinois/ncsa/daffodil/section07/escapeScheme/escapeSchemeUnparse.tdml
daffodil-test/src/test/scala-debug/edu/illinois/ncsa/daffodil/section07/escapeScheme/TestEscapeSchemeUnparseDebug.scala