PDFNet: regression in DOCX template conversion

Product: PDFNet for JAVA

Product Version: 9.2.0

Please give a brief summary of your issue:
It is unable to use special characters as a part of DOCX variable. (e.g. ā€˜%ā€™)

Please describe your issue and provide steps to reproduce it:
Since 9.2.0 it is unable to use special characters in DOCX variable name.
In our PRODUCTION we use special prefix ā€˜%ā€™ to recognize a variable as a special type.
Since 9.2.0 we get this error:

	 Message: document layout failed: Exception: 
	 Message: Template error: Template key uses illegal character '%':
	Signature1: {{%signature1}}
	 Conditional expression: isalnum(str[id_len])
	 Version      : 9.2.0-91be0af529
	 Platform     : OSX
	 Architecture : AMD64
	 Filename     : Template.cpp
	 Function     : Lex
	 Linenumber   : 753

	 Conditional expression: 
	 Filename   : FlowToPDFConversion.cpp
	 Function   : PDF::DocxConversion::Convert()
	 Linenumber : 189
	 Error code : 0

	at app//com.pdftron.pdf.Convert.OfficeToPdfWithFilter(Native Method)
	at app//com.pdftron.pdf.Convert.officeToPdf(Convert.java:3175)

Please provide a link to a minimal sample where the issue is reproducible:

Hello, Iā€™m Ron, an automated tech support bot :robot:

While you wait for one of our customer support representatives to get back to you, please check out some of these documentation pages: