"0B," "2B," etc., appearing in front of header upon export from Word 365
I have text boxes in Word for document headers and footers. They contain STYLEREF fields, pulling the most recent instance of Heading 1 into each text box. When I export to tagged PDF, each of these headers or footers has extraneous characters at the beginning. For example, the first Heading 1 is "1. Situation." (This is flat text, not autonumbered.) In the PDF it reads "0B1. Situation." A later Heading 1 is "5. Oversight, Coordinating Instructions, & Communications." It becomes "4B5. Oversight, Coordinating Instructions, & Communications" in the PDF. Attached are screen captures of the field in the Word doc and of the result in PDF. I am using Microsoft 365 Apps for Enterprise, Microsoft® Word for Microsoft 365 MSO (Version 2208 Build 16.0.15601.20676) 64-bit and Adobe Acrobat Pro Version 23.001.20143.0. How can I get rid of these extraneous characters, short of unlinking all the fields and turning them into flat text?

