Unfortunatly this plugin seams to be broken in UE 5.3. Everything worked perfectly fine in 5.2 but since updating to 5.3 and the new plugin versions it no longer does sync anything.
While playing in Editor with 2 clients it’s synced. But on a standalone build either Dedicated Server or P2P it’s always and instantly out of sync and does never sync at all.
Which is a massive bummer. The setup is unchanged from 5.2 to 5.3. Only the Engine and the Plugin was updated.