Actinia Core is an open source REST API for scalable, distributed, high performance processing of geographical data that uses mainly GRASS GIS for computational tasks (DOI: https://doi.org/10.5281/zenodo.5879231) | Tutorial: https://actinia-org.github.io/actinia-core/ | Docker: https://hub.docker.com/r/mundialis/actinia-core
The exporter still eliminates the color table in case of COG export:
https://github.com/actinia-org/actinia-core/blob/506e1b04efd4225470f7a9c50fe659e5f6b499d0/src/actinia_core/processing/actinia_processing/ephemeral/ephemeral_processing_with_export.py#L156
Reason was a bug in GDAL <3.1.4 which has been fixed and released in Oct 23, 2020.
I think that lines 152 - 156 should simply be removed.