[fmbb]

The very first sentence of the article you linked says this happens because they lose the pheromone track.

[viraptor]

It does, but the original paper is not as certain. (https://digitallibrary.amnh.org/server/api/core/bitstreams/8...) It suggests that the following is done "both chemically and tactually" in case of a circular path, although with just a minimal test.