Data defined label does not works anymore in combinaison with rule based labeling

[qgib]

Author Name: Dominique Lyszczarz (@domlysz)
Original Redmine Issue: 19979
Affected QGIS version: 3.2.3
Redmine category:labelling
Assignee: Nyall Dawson

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Please find in attachement a simple project that illustrate the issue : trying moving a label does not works.

The issue appears since 3.2.2 or 3.2.3 (as I tested it works correctly on 3.2.0 and fails on 3.2.3).

After more investigation, I could notice that a project with this kind of setup saved with 3.2.0 also works correctly on 3.2.3 but will fails again if the rules are editing. Comparing qgs files between a working and non working reveals that non working file missing rule uuid :

working qgs file:
@
@

non working qgs file:
@
@

Adding an uuid make the labels movable again.

Investigate the commits, it seems b6901e2 is the cause of the regression : uuid creation was removed from qgsrulebasedlabeling.cpp (line 68)
b6901e2

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• data_defined_rules_labels.qgz (Dominique Lyszczarz)

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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• assigned_to_id was configured as Nyall Dawson
• status_id was changed from Open to In Progress

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Applied in changeset 0e2ceb9.

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• done_ratio was changed from 0 to 100
• status_id was changed from In Progress to Closed

[qgib]

Author Name: Decio Yokota (Decio Yokota)

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Moving labels doesn't seem to work again in version 3.6.2. This is probably true in earlier versions as seen in: https://gis.stackexchange.com/questions/290780/move-label-not-working/321272#321272

Manually clicking in data defined X and Y coordinates and storing them on project makes it work.