We know several limitations related to the Fields - Custom Field Types for Jira app related to Atlassian Forge framework.
Integration with Confluence macros, PowerBI, JXL, and other third-party apps is very limited, if not impossible.
Please vote and add comments on the linked support tickets. It is important to show Atlassian decision-makers the value of the missing features.
Transition Screens
Using the Forge custom field on transition screens is impossible. The fields can be assigned to the screen, but they will be rendered as text fields.
https://ecosystem.atlassian.net/browse/FRGE-322
Inline Editing on Jira Issue View
Forge custom fields do not support inline editing on issue view.
https://ecosystem.atlassian.net/browse/FRGE-243
Jira cloud mobile app support
Forge custom fields do not work on Jira Cloud mobile app.
https://ecosystem.atlassian.net/browse/FRGE-538
Bulk Update
https://ecosystem.atlassian.net/browse/FRGE-648
Forms
https://ecosystem.atlassian.net/browse/FRGE-1243
Release date: UNKNOWN
Issue view tabs
Calculated and Comment fields (Hardcoded fields) won´t appear on screens where the Default or Field tabs are not selected.
Issue Navigator support for images, graphics and avatars
Forge custom fields with graphics(pictures, avatars, etc.) do not work well in issue navigator and boards
https://ecosystem.atlassian.net/browse/FRGE-135
Jira automation not fully supported
https://ecosystem.atlassian.net/browse/FRGE-1108
JWM list view
Forge custom fields do not work in JWM list view.
https://ecosystem.atlassian.net/browse/FRGE-1114
Other third party apps (JXL, PowerBI)
Using Forge custom fields in other apps doesn’t always work as expected. Third party integration such as JXL or PowerBI can pose issues when trying to use Forge custom fields with the app. It is currently in plan to make CFS fields compatible with other apps.