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Not really. 0.19.2 is not a major update, it supposedly has some network fixes, but nothing that requires consensus.

So far as a top 20 I have not had any issues with 0.19.2, and would encourage people to go ahead and upgrade, but many witnesses follow "if it ain't broke, don't fix it".

ahh so it doesn't give any compatibility issues between an upgraded and a non upgraded witness .