1 test failed. format:does not modify original moment instance (3439.2)

[benique]

Client info

Date String   : Tue Mar 16 2021 12:37:35 GMT+0100 (CET)
Locale String : 16.3.2021, 12:37:35
Offset        : -60
User Agent    : Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.1 Safari/605.1.15
Moment Version: 2.29.1

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format:does not modify original moment instance (3439.2)

issue #5681 regression

// Expected date,Invalid
// Actual   Invalid,date
Invalid,date === date,Invalid

ALM