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https://issues.apache.org/jira/browse/NIFI-3575?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15902030#comment-15902030
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Joseph Percivall commented on NIFI-3575:
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This is consistently repeatable with any number of components being dragged
into the PG, as long as you enter the target PG fast enough.
> Can lose entire process group when moving components into it from parent PG
> ---------------------------------------------------------------------------
>
> Key: NIFI-3575
> URL: https://issues.apache.org/jira/browse/NIFI-3575
> Project: Apache NiFi
> Issue Type: Bug
> Reporter: Joseph Percivall
> Priority: Critical
>
> When you move any component from the parent group and drag and drop it into a
> process group, if you immediately enter the process group (within
> approximately half a second) the process group will cease to exist (even if
> it had contents already).
> If the UI renders the graph initially, attempting to refreshing the canvas
> returns "Unable to locate group with id: <id of process group that died>".
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