I have a vanilla mission on Altis with way too many objectives (about 110 per OPCOM so near 220 total which is why I haven't released it) and the pre-play map screen where the briefing would be is fine. That missions is vanilla, plus Spyder Addons.
Also in my released missions which use a crap ton of mods and scripts, which average around 85+ objectives a piece, the briefing screen is just fine too and those missions actually have diary record briefings.
That said I haven't tested in a dedicated server environment recently. Just SP and/or LAN. Is this only happening on a dedi?
Errors will most definitely make strange stuff happen on initialization. But your report example wouldn't have those I don't think.
For various reasons reported today I need to hop on my server to get a look-see at how ALiVE and Spyder Addons are working in that kind of environment. I'll let you know what I see later. Strange stuff.