It's not a 100% reliable thing but yes this is a well known bug, been around for donkeys' years on many other servers.
Some servers script a +2 dexterity bonus to apply for a second after the various entanglement, web and their respective bolt attacks are finished since recalculating your dexterity with a spell-like effect will also fix it.
Though a simpler fix would be a debug option to apply the dexterity bonus momentarily from a rest menu selection as that would do it too, with the added benefit you can't just spam the command during combat if it's in a dialogue, so that people do not need to re-log. (The mass exodus of player groups that need to relog, as well as those that don't realise they have been affected and die pretty quickly for having their AC treated as if their dex was still 3 is pretty funny though.)