Solved Can't feature specific thread

[Russ]

I have an "Ultimate test thread" on my dev site and for whatever reason I can't seem to feature it. Nothing crazy in the thread. Images inserted, images attached, zips attached, various default BBcode's on the first post. Not sure what's going on.

Error:

Oops! We ran into some problems.
LogicException: Instances of XF\Db\AbstractAdapter cannot be serialized or unserialized in src/XF/Db/AbstractAdapter.php at line 686
XF\Db\AbstractAdapter->__sleep()
serialize() in...
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