Bug Description

Expected Behaviour
There is a CSS syntax error in the "style amp-custom" tag.
Screenshots
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PHP Version
8.4
Plugin Version
2.5.5
AMP plugin template mode
Reader
WordPress Version
6.8.1
Site Health
No response
Gutenberg Version
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OS(s) Affected
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Browser(s) Affected
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Device(s) Affected
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Acceptance Criteria
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Implementation Brief
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QA Testing Instructions
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Demo
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Changelog Entry
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