Description:
The attached PPTX has text with "Assistant" font. The text in PDF exported from Impress has transparent text.
This is a regression in LO 7.5.0.3.
It was OK in LO 7.4.5.1.

The PPTX was created in Google Slides using the Assistant font.
Assistant font:
https://fonts.google.com/specimen/Assistant

Steps to Reproduce:
1. Install all Google Fonts on Ubuntu 22.04 from https://github.com/google/fonts/archive/main.tar.gz
2. Refresh the font cache with: "fc-cache -fv"
3. Open the attached PPTX in Impress and export to PDF.
$. Open the PDF and see that the text is transparent.

Actual Results:
Visible text.

Expected Results:
Transparent text.


Reproducible: Always


User Profile Reset: No

Additional Info:
Bad version:
Version: 7.5.0.3 (X86_64) / LibreOffice Community
Build ID: 50(Build:3)
CPU threads: 2; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: en-IL (en_IL); UI: en-US
Ubuntu package version: 1:7.5.0~rc3-0ubuntu0.22.04.1~lo1
Calc: threaded

Good version:
Version: 7.4.5.1 / LibreOffice Community
Build ID: 40(Build:1)
CPU threads: 2; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: en-IL (en_IL); UI: en-US
Ubuntu package version: 1:7.4.5-0ubuntu0.20.04.1~lo1
Calc: threaded