(Regression) Contribution page amounts change on save when > $1,000
Attached is a video replicating the bug on dmaster.demo.civicrm.org.
When specifying a donation amount of $1000 or more (on a monolingual en_US site), the amount is saved as $1,000.00
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When you press save again, the comma is treated as a decimal separator, and so it's resaved as $1.