Font gets changed to Arial in front of fields

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Describe the Bug

When inserting text right in front of a field command (in German it is called "Feldbefehl"), the font changes to Arial.

Steps to Reproduce

1. Use this file: xxx.docx
2. Place the cursor in front of <<RVORNAME>>
3. Type in some text
4. See, that the font of your text is Arial instead of Times New Roman

Expected Behavior

The font should not change.

Actual Behavior

The font of the text typed in changes to Arial.

Screenshots

This is the type of field:

Font is Times New Roman:

Font changes to Arial when inserting text in front of field:

Font remains Times New Roman when inserting text after the field:

Desktop

(Please complete the following information)

• Collabora version: Collabora Online - Built-in CODE Server 24.4.402
• OS and version: Ubuntu 22.04.4 LTS
• Browser and version: Mozilla Firefox 115.12.0esr (64-Bit)

Additional Context

I opened this as a seperate issue, du to the advice of @Tex2002ans. It could be related with issue https://github.com/CollaboraOnline/online/issues/6382

Here is the nextcloud.log file that was generated during reproducing the issue. (loglevel set to 0) nextcloud.log