Still happens it seems. Have a few mods on this server and the only difference between the save files is this:
300,301c300
< \x03\xa5\x8cjd\x01\xd8,
< \xc0J\xbeH</random-generator>
---
> \xb5Y\xfc\x03\xfdd\x01\xd8\x9c1\x07S</random-generator>
34881,34882c34880
< \x01
< \x00\x00\x00\x00\x00\x00\x00<active-entities>
---
> \x01\x0b\x00\x00\x00\x00\x00\x00\x00<active-entities>
34888a34887,34892
> <entity name=water-splash-smoke position={-52.0625000000,
> -46.7109375000}>
> <targeter name=water-splash-smoke position={-52.0625000000,
> -46.7109375000}>
> </targeter>
> </entity>
1702208c1702212,1702235
< 5\x1e\x92\x90\x0f\xa7}\xbf\xb1\xebP\x1739k?\x1e\x00\x00\x00\x00\x00\x80?\x00\x00\x00\x00\x02\x00\x00\x00\x00<character name=OvermindDL1>
---
> 5\x1e\x92\x90\x0f\xa7}\xbf\xb1\xebP\x1739k?\x1e\x00\x00\x00\x00\x00\x80?\x00\x00\x00\x00\x02\x00\x00\x00\x00<entity-data name=water-splash-smoke>
> \xbc\x08<position {-52.0625000000,
> -46.7109375000}>
> \xf0\xcb\xff\xffJ\xd1\xff\xff</position>
> \x00\x10<bounding-box>
> <position {-52.0625000000,
> -46.7109375000}>
> \xf0\xcb\xff\xffJ\xd1\xff\xff</position>
> <position {-52.0625000000,
> -46.7109375000}>
> \xf0\xcb\xff\xffJ\xd1\xff\xff</position>
> <orientation>
> \x00\x00\x00\x00</orientation>
> </bounding-box>
> \x00\x00\x01<has-surface>
> \x01\x00</has-surface>
> <targeting-me-index>
> \x01</targeting-me-index>
> </entity-data>
> <updatable-entity-flags>
> \x01</updatable-entity-flags>
> <cyclic-frame-position>
> \x98\x99\x91@</cyclic-frame-position>
> \xdd\x9a\xa2T@\xfbY\xbf\xa7c\x80\x90g\x13g?\x1e\x00\x00\x00\x00\x00\x80?\x00\x00\x00\x00\x02\x00\x00\x00\x00<character name=OvermindDL1>
I.E. the random number generator differs between the saves and there is a water-splash-smoke that exists on the server side but not the client.
Was also running this mod on an old server not long ago with a very different set of mods (very little overlap) and such errors happened there as well, though never this succinct.
