Thank you kindly Grumly57 for a patch to solve:

Grass type is not persisted. Try to rez some grass several time to have different random grass types around, then immediately move a couple of them. Or restart the sim and logon again. You'll see all grass types reverted to a dull default one :-)

OpenSim/Framework/Data.SQLite/Resources/001_RegionStore.sql

@@ -72,6 +72,7 @@ CREATE TABLE primshapes(UUID varchar(255) primary key,
         ProfileEnd integer,
         ProfileCurve integer,
         ProfileHollow integer,
+        State integer,
         Texture blob,
         ExtraParams blob);