Creating event: copy date "from" to "to" via clipboard

[JanTheMan1010]

1. Login into webclient calendar
2. Click "+" on bottom right corner
3. Select a date
4. -> The selected date will appear in "from" and "to"
5. Change "from" date
6. -> "to" date hasn't changed (which is fine)
7. Select "from" date and copy to clipboard
8. Try to paste the copied date into "to"
9. -> Doesn't work

Goal: I want to copy date between "from" and "to" via clipboard.

The issue is attached as gif.