"Reliving" means it's a remembered thought, i.e. not a current one. The actual thought text should appear instead of " ." at the end. You can get this when hacking DF to check what they are, in particular if you don't have valid subthought/and or severity value.
You'll get the same display when hacking in 257, for instance.
Thoughts 243 - 259, with 257 missing, have been identified to a lesser or greater extent in
https://github.com/DFHack/df-structures/issues/363, but nobody has entered it into the mess that describes it.
Also, some thoughts are intended for other purposes than as fortress thoughts, e.g. in history events (251 [from afar], for example, is quite common for artifact claims), and so might not have any fortress thought mapping at all.
It is a bug if this has occurred naturally, as descriptions shouldn't be cut short.
A guess is that a guild hall or temple might have been removed, in which case DF might have failed to find the referenced "building". If you can check what entity 4746 is you might find a religion or guild.
Edit: Didn't manage to provoke any text for 260-262 when starting with a guildhall thought.