curved labels gone missing when project's CRS is WGS84 but shows up fine using a UTM CRS

[qgib]

Author Name: Mathieu Pellerin - nIRV (Mathieu Pellerin - nIRV)
Original Redmine Issue: 6595
Affected QGIS version: master
Redmine category:labelling

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Steps to reproduce issue:

1. load roads shapefile attached to issue 6594
2. Enable labelling with this conditional query "highway" IN ('primary', 'secondary', 'tertiary') *
3. Set project's CRS to EPSG:3148 (UTM Indian 1960 48N)
4. Set scale to 1:3390
5. Center map to roundabout located at 492052,1279353
6. Notice the label "Rongvong Mul Wat Phnom" label
7. Switch project's CRS to EPSG:4326 (WGS84)
8. Notice the absence of label, even though there's enough space on line.

[qgib]

Author Name: Jürgen Fischer (@jef-n)

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• category_id was configured as Labelling

[qgib]

Author Name: Giovanni Manghi (@gioman)

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• easy_fix was configured as 0
• regression was configured as 0

[qgib]

Author Name: Giovanni Manghi (@gioman)

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End of life notice: QGIS 2.18 LTR
*
Source:*
http://blog.qgis.org/2019/03/09/end-of-life-notice-qgis-2-18-ltr/

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• resolution was changed from to end of life
• status_id was changed from Open to Closed