Rain in the snapshots for 1.16 and release versions of 1.16 and 1.16.2 does not observe solid blocks, for example i will be in my strip mine or my house and rain will be going through the blocks despite them being in the way. Also on the surface rain is inconsistent in the same biome. For example, it will be raining in one part of the plains biome, but not the other. 

Every time it rains, the glitches present themselves in the same places.