After editing an unconnected page, a dialog appears:

Something went wrong
Unable to parse the messages page MediaWiki:Gadget-AutosuggestSitelink-messages/cs. There may have been a recent change that contains invalid JSON.

I cannot see, what is incorrect in the linked page – or whether FuzzyBot edits are causing problems with the tools functionalities.

Apart from that, the tool shouldn't stop working just because of bad translation/JSON configuration (there should be at least some fallback to en version).