I use UE 5.4.1 source code version.
There is also the same error.
While comparing with version 5.3, I solved the error by modifying the following code.
I modified the code in Engine/Source/Runtime/XmlParser/XmlFile.cpp.
if (IsWhiteSpace(Ch) && Ch != TEXT(‘\n’) && !bInQuote) ==>
if (IsWhiteSpace(Ch) && !bInQuote)
Currently the source controller is working fine.
I haven’t noticed any other issues with this fix.