Error with Astah plug-in SDK due to restricted access to Maven central repository

From January 15, 2020, connections to Maven’s central repository have been restricted to https.
This may cause errors when using Astah plug-in SDK.

Rearranging the order of Operations in Class Diagram resets Operation setting of the Sequence Diagram Messages

When Operations are allocated to the Messages in a Sequence Diagram from the BaseClass of lifeline, rearranging the order of those Operations in Class Diagram by mouse will clear out the allocation.