Discarding message in an old incarnation

[Matthew Evans]

Hi,

We have a system running R19 that occasionally throws out this message:



2020-08-06 19:17:46 =ERROR REPORT====
Discarding message {'$gen_cast',{compatibility_handling,3,3}} from <0.355.0> to <0.405.0> in an old incarnation (1) of this node (3)

Can someone explain what it means? It's in a mesh, but all nodes are/should be running the same version.

Many thanks
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