Description:
LibreOffice Impress show some blurry images when a file exported from Office Online is opened in local machine

Steps to Reproduce:
1. Download attached file (happens with .pptx and .odp)
2. Open it with LibreOffice (7.1 alpha - nightly built appimage)
3. Go to 4th slide
4. Check if images are blurry https://imgur.com/a/4d4R3RQ

Actual Results:
Some of the images over the figures are shown as blurry images.

Open the presentation mode and images are shown clear

Expected Results:
Images should appear clear and without artifacts


Reproducible: Always


User Profile Reset: No



Additional Info:
Images shown are very blurry and is almost impossible to see what are them. The file has not been generated with LibreOffice, it was generated using PowerPoint online and then downloaded in my local machine. It happens to .pptx and .odp.

I'd like to clarify that it is not [or it should not be] an export error of the online platform, because it disappears on presentation view: images are shown clearly, but only on the big screen, on the presenter view, they are still blurry.

Footnote: after having the program opened some minutes (between 5 and 10 minutes), the images are then shown clear.

Check the before and after here: https://imgur.com/a/4d4R3RQ


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Version: 7.1.0.0.alpha1+
Build ID: 54daa022df46d07171201b3fe236cf3f5726e271
CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: es-ES (es_ES.UTF-8); UI: en-US
TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:master, Time: 2020-11-05_16:52:13
Calc: threaded

I've seen it on LibreOffice 7.0 and 7.1 alpha (daily built appimage)