Judging by version numbers, it looks exactly like a bug that has been fixed, in the versions released on 11 Apr 2024 (8.1.28, 8.2.18, 8.3.5).

Though I cannot find a relevant entry in the release notes. The only rational explanation I can come up with is that some other fix collaterally fixed this one as well.

Or, it could have been fixed in the underlying library and came into effect when PHP dependencies have been updated.