The security patch updates in China are a bit different than in the rest of the world. Apparently, the updates there come also with bug fixes and other improvements. Seems that this is the case with the May security update for Nokia X71 that just got released in China. The software update named 118J.B04 is 141 MB large and brings system stability and fluency improvements, optimized camera shooting, and Google Security Patch 2019-05, at least that is how Google translated it :).
If someone is reading NokiaMob in China, well check your phone since the update is available ;).