Unity 5.3.5f1 detaches attached state machine behaviors in animator, help

Unity Engine
1

[SOLVED] Unity 5.3.5f1 detaches attached state machine behaviors in animator.
This has happened three times now after upgrading a few days ago.
No error messages are thrown, it just happens.

2

bump

3

@bataillian This was fixed in the 5.4.0f1 release

4

Thanks!

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I am wary of updating mid-project, but am having some other inexplicable results around state machine behaviors so I am considering it. Have you had any new issues with update?