Merge Fields in Word Template export do not work when edited

Hello all,

export tracker to word using eg. default system template works fine and data are visible.

But it does not work if Merge Field is edited:

 1) { MERGEFIELD  author \* MERGEFORMAT }  -> author is rewritten manually

or

2) { MERGEFIELD  author \* MERGEFORMAT }  to { MERGEFIELD  baseline \* MERGEFORMAT }

or manually inserted : Insert tab > Text > Quick parts > Field > Merge field

If working Merged Field is copy/past then it works.

Is there any special formatting or syntax needed for working with Merged Fields in Word document?

thank you