Limitation of Multi-select OptionSet in Dynamics 365

In the July Update, long waited Multi Select OptionSet is cool. People started using it. So far i haven't seen issues or limitation on any forum. I have faced few issues recently which i wanted to share to benefit others.

Limitations Faced:

1.Multi-select optionset cant be used in the Form Head Section

2.There is no method provided in SDK to query the field values

3.Multi-select option set fields cannot be a calculated or rollup field (single-select option set fields can be a calculated field).

4.Multi-select option sets support only the web client, unified interface, advanced find, FetchXML, Platform SDK, and Client SDK

5.We cannot set default value during the field customization

Featured Of MultiSelect OptionSet:

• New AttributeType: MultiSelect Option Set
• The ability to add them to forms, views, and quick create forms, and read-only and editable grids
• Can add up to 150 values available for selection
• Select All and Clear selection feature
• Can leverage existing (select a global) and new option sets
• Supported in Web Client and the new Unified Interface (coming in July as well)
• Supported in Advanced Find and FetchXML queries