[wp-trac] [WordPress Trac] #53332: Transforming a Legacy Widget to a Block Widget is not possible in WP 5.8

[WordPress Trac]

#53332: Transforming a Legacy Widget to a Block Widget is not possible in WP 5.8
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 Reporter:  imath         |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Widgets       |    Version:
 Severity:  normal        |   Keywords:
  Focuses:                |
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 Hi,

 I'm currently working on migrating BuddyPress legacy widgets to BuddyPress
 Blocks to anticipate the introduction of the Widgets Block Editor into
 WordPress 5.8.

 This [https://developer.wordpress.org/block-editor/how-to-guides/widgets
 /legacy-widget-block/#allowing-migration-to-a-block documentation page] is
 explaining the steps to allow migrating a Legacy Widget to a Block one.
 I've applied it and it's working fine using the Gutenberg plugin (10.7.1)
 in WP 5.7.2 as shows the following screen capture :

 [[Image(https://cldup.com/9Ki9SucsM4.png)]]

 But as soon as I switch to WordPress trunk (5.8) (having the Gutenberg
 plugin deactivated), the list of transformations doesn't include anymore
 the BP Block. Here's a screen capture of the result in 5.8:

 [[Image(https://cldup.com/-8wku15-ws.png)]]

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Ticket URL: <https://core.trac.wordpress.org/ticket/53332>
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