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I know you are asking of a Qgis or a grass answer, however this can be done easily in R by rasterizing your point shape file. You use the terra package to do that (would work with the raster package as well, but terra is more recent and better)
library(terra)
the_raster_from_your_study_area <- rast("path/to/your/raster/file")
...
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After a lot of trial and error, I believe the export issue is related to how QGIS calculates the gradient when the coord mode is set to viewport. To eliminate any interference from the underlying map, I created another layout in the print composer with just the indicator map on a blank background.
When the map is sized small, the above issue persists. On ...
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