Hi
I just installed the pack using the start.sh method and I ended up with 3 missing server-side mods according to [Netty Client IO] and I had incompatible icon in the server selector

pack and server version 1.12.1

...
(183/261) Skipped Better Tag NBT Tips (wrong side)
...
(239/261) Skipped Searchables (wrong side)
...
(252/261) Skipped Yeetus Experimentus (wrong side)

[Netty Client IO #12/INFO]:Client has mods that are missing on server: [bettertags, searchables, yeetusexperimentus]