The Arena vaulted ceiling (single) is blocking my way. There is something, in the middle of the “wall end” edge, that stops me. I can squeeze past left or right, but if there is a door entrance, right before / behind it, it usualy doesn’t work. Dont know, if NPCs can get over this piece at all (didn’t test it).
Not that this solves it (especially if it also applies to thralls), but are you able to jump to get ‘over’ the obstruction?
Please also report this to helpshift - Contact Us — Conan Exiles Help Center - as that is where CEE bug reports need to go so the devs see them sooner. (But please also continue to report here as well so they can be added to the player-maintained lists.)
Yes.
And not just Arena set, it happens to all vaulted ceilings.
You should definitely file a bug report like @DanQuixote suggested.
I have filed mine yesterday and we could always use more.
Jumping would work, so does going left or right from the midpoint of the edge, unless there is a doorway next to it.
I have filed a bug report now, too. thx
Btw, is it normal, or wanted, that its not possible to build, a (normal) ceiling piece, on top of the vault? It should be, imo, its way to thin to hold on its own. This doesnt look good, and limits the usage immensly. At the moment, you just can build it under fundation pieces. Its a very nice building piece, though, and I would use it alot, and I did, but had to demolish most of it, because, as it is now, its rather useless.
Unfortunately, the Arena vaulted ceilings were the first iteration of the design and seem to have only been considered for use specifically together, so you can’t (for example) put a ceiling tile between them because the thickness looks terrible. The later versions (eg Nemedian, Argossian, Stormglass) fixed this by being designed at the correct thickness (and with texturing on top to match up with ceiling pieces from the set).
As far as I recall, you can put foundations on top of the Arena vaulted ceilings, so if you can afford the extra height in the build, that provides a way to cover them over. But you still wind up with the problem that you can’t leave a gap between them, because foundations don’t give each other stability horizontally.
Thanks for confirming that - it means it is the same issue I’m encountering as well. I’ve added another report via the direct report tool in Public Beta so they may see it from a different ‘angle’.
also the spider webs from the baazar, they was passable before now the they blocks the passage
Yeah, apparently that has been the case since the upgrade to UE5. Might be worth reporting to helpshift though, because I don’t know if the original reporter did report it there (they planned to, but after they slept ‘if they remember’, so they might not have done).
I’ve seen vaulted ceilings, spider webs and curtains mentioned so far. Will be poking the team about these and please feel free to let me know if I am missing any other items 
Regarding the vaulted ceilings - as far as I am aware it is specifically the ‘Vaulted Ceiling (single)’ that seems to have this problem (though might still be worth checking others to be sure).
Spider webs gained collision (according to reports) with the upgrade to UE5 - I know for a fact it applies with the version recently given away for free in the bazaar - possibly it applies to all spider webs, possibly just some (reports have been a little unclear).
Curtains always had collision, but it would be a nice upgrade if they didn’t, especially given Living Settlements.
Additional ‘collision’ reports I can find -
Chest lids have collision and can cause players to be launched into the air - since upgrade to UE5
Some placeable items are missing collision since the upgrade and cannot be interacted with at all after being placed - link shows some specific item numbers
Thralls have been falling through foundations (again) since 15 September - seems to be directly related to thralls placed on Siege Cauldrons (and possibly archer posts) - link
I hope that helps 
Thank you so much Making sure the team has eyes on these 