When using the mode="datetime" and the v-model is null, when selecting a date in the date tab the modal closes and doesn't allow to select a time. If the v-model exists the behaviour is as expected.
You can check this on the demo page clearing the value of any datetime datepicker and trying to set a date with time.
This is the correct behaviour:

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This is the wrong one (note the null model):

The gifs were made on the demo page using Chrome Version 77.0.3865.90
When using the
mode="datetime"and thev-modelisnull, when selecting adatein the date tab the modal closes and doesn't allow to select atime. If thev-modelexists the behaviour is as expected.You can check this on the demo page clearing the value of any
datetimedatepicker and trying to set a date with time.This is the correct behaviour:

--

This is the wrong one (note the
nullmodel):The gifs were made on the demo page using Chrome Version 77.0.3865.90