Apple Watch Calendar Events: Default Alerts

Copied from Herdsofnerds post, since there's no attention to this problem.

Reposting same issue as described in closed posts below (locked due to lack of response):

apple watch calendar default alert

Apple Watch new calendar entry - missing reminder

Issue: Calendar events created from an Apple Watch (via Siri) do not get any default alert assigned, regardless of 'Settings > Calendar > Default Alert Times' configured on the paired iPhone.

Similar to previous posts, have tried following before and after contacting Apple Support via chat:

restarting both devices

restarting both devices, but after first changing iPhone > Calendar > Default Alert Times' to 'None' and ensuring 'My Watch > Calendar' settings in Watch app was configured to 'Mirror my iPhone' before restarting; then, then setting new iPhone Calendar default alerts times again

unpairing and pairing Watch again - with restore from backup

unpairing and pairing Watch again - this time, *without* restore from backup (i.e. as new Watch)

Devices:

Watch Series 3 cellular, WatchOS 4.3

iPhone 8 Plus, iOS 11.3

Adding to his post: This problem makes calendar on apple watch useless for me. Making events on apple watch then having to open my iphone to set an alert so I don't forget about the event defeats the whole purpose of using the watch in such scenario. Fix it please this isn't acceptable at all.