Symfony version(s) affected: all

Description
When submitting a form via Edge using the TimeType; Edge will submit the value with both seconds and milliseconds every time regardless of the step attribute (e.g. 20:11:00.000). This is valid according to W3C.

It looks like Symfony is unable to parse the milliseconds in the DateTimeToStringTransformer and this then causes an invalid value.

This only seems to be an issue since Edge has moved to Webkit.

How to reproduce

1. Create a form with a TimeType
2. Attempt to submit the form with a value in Edge 80+

Possible Solution

Additional context