Legend in Print Layout does not follow set map-theme

[qgib]

Author Name: Jamie Sheehan (Jamie Sheehan)
Original Redmine Issue: 20055
Affected QGIS version: 3.3(master)
Redmine category:map_composer/printing

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If multiple map themes are created using different styles for the 1 layer, and Print Layouts are created using the "follow map theme" option, the Legend incorrectly shows styles as per the theme currently being displayed in the Map Composer, not as per the Map Theme chosen in the print layout. This glitch can be overcome by selecting the appropriate Map Theme in the Map Composer each time a Print Layout is to be exported, however, it prevents the use of automated Print Exports for multiple layouts, and introduces significant chances of error by forgetting to update the Map Composer every time.

For example -
See attached images, where I have saved 2 Map Themes... "No Style" and "Categorised".
I then create a Print Layout and set it to follow Map Theme "Categorised". While the Map Composer is showing the same theme, the legend displays correctly. However, if the Map Composer is switched to a different Map Theme, the Legend in the Print Composer no longer reflects what is being shown in the print layout, and instead reflects the Map Theme of the Print Composer.

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• MapTheme1_NoStyle.jpg (Jamie Sheehan)
• MapTheme2_Categorised.jpg (Jamie Sheehan)
• PrintLayout_LegendShowingMapThemeNoStyle.jpg (Jamie Sheehan)
• PrintLayout_MapThemeCategorised.jpg (Jamie Sheehan)

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Related issue(s): #24694 (relates)
Redmine related issue(s): 16795

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[qgib]

Author Name: Harrissou Santanna (@DelazJ)

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• relates was configured as [Composer Legend] Symbology of layer always follows the map canvas and breaks the composer legend #24694

[qgib]

Author Name: Saber Razmjooei (@saberraz)

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• operating_system was changed from Windows to
• version was changed from 3.2.3 to 3.3(master)

[qgib]

Author Name: Nyall Dawson (@nyalldawson)

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Duplicate of #24694

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• resolution was changed from to duplicate
• status_id was changed from Open to Closed