Release v24.4.6 and above kills all default shadow opacity

[felixhix]

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Describe the bug
Opening existing drawio files with the new release v24.4.6 and above will modify all "default" shadows from 25% to 100% in the whole file. The modification is permanent (opening the file with older releases will result in shadow of 100% on all elements).

To Reproduce
Steps to reproduce the behavior:

1. Create a new file with older release
2. Place box in the diagram
3. Enable shadow (should be 25% by default)
4. Save file and open it with newer release (v24.4.6/*.7)
5. Box shadow opacity is set to 100% (see screenshots below)

Expected behavior
No modification on existing elements (should be left by 25%)

Screenshots
v24.4.0 vs v24.4.6 and v24.4.7

draw.io version (In the Help->About menu of the draw.io editor):
v24.4.6 and v24.4.7

Desktop (please complete the following information):

• Desktop / MacOS

[davidjgraph]

Fix in 24.4.8, thanks for report.