Export as WKT1 ESRI or WKT1 GDAL silently returns None for custom CRS

Export as WKT1 ESRI or WKT1 GDAL silently returns None for custom CRS: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). crs wkt = 'PROJCRS "unknown",BASEGEOGCRS "unknown",DATUM "unknown",ELLIPSOID "WGS 84",6378137,298.257223563,LENGTHUNIT "metre",1,ID "EPSG",9001…