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I have a land cover raster downloaded from NLCD website with CRS as **EPSG: 42303** - NAD 83/Albers NorthAM. I reprojected it to **EPSG: 102740**, Texas State Plane South Central Zone 4204 via Warp of QGIS. However, when I check the the reprojected new raster CRS, it shows its CRS as

USER:100030 - * Generated CRS (+proj=lcc +lat_1=28.38333333333333 +lat_2=30.28333333333334 +lat_0=27.83333333333333 +lon_0=-99 +x_0=600000 +y_0=3999999.999999999 +datum=NAD83 +units=us-ft +no_defs) - Projected.

Should not it be EPSG 102740 as I directed Warp to do?

Or how I can fix this bug (if it is a bug of QGIS Warp).

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There is no EPSG:102740 as you can check from https://www.epsg-registry.org/. It is actually a code defined by ESRI https://spatialreference.org/ref/esri/102740/. However, GDAL does know what it means and is using EPSG:102740 as a synonym in reading. 

gdalsrsinfo epsg:102740 PROJ.4 : +proj=lcc +lat_1=28.38333333333333 +lat_2=30.28333333333333 +lat_0=27.83333333333333 +lon_0=-99 +x_0=600000 +y_0=3999999.999999999 +datum=NAD83 +units=us-ft +no_defs OGC WKT : PROJCS["NAD_1983_StatePlane_Texas_South_Central_FIPS_4204_Feet", GEOGCS["GCS_North_American_1983", DATUM["North_American_Datum_1983", SPHEROID["GRS_1980",6378137.0,298.257222101]], PRIMEM["Greenwich",0.0], UNIT["Degree",0.0174532925199433]], PROJECTION["Lambert_Conformal_Conic_2SP"], PARAMETER["False_Easting",1968500.0], PARAMETER["False_Northing",13123333.33333333], PARAMETER["Central_Meridian",-99.0], PARAMETER["Standard_Parallel_1",28.38333333333333], PARAMETER["Standard_Parallel_2",30.28333333333333], PARAMETER["Latitude_Of_Origin",27.83333333333333], UNIT["Foot_US",0.3048006096012192], AUTHORITY["Esri","2278"]]

The CRS that QGIS saves as USER:100030 has all correct parameters and it should work just fine for you.

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