Isn´t this depending on what setting that flex track sample got regarding Loop?
That is, if it is set to on in A01 pattern. It will still loop even when changing to A02 (with no trig), because you literary haven´t stopped that sample loop when coming from A01.

If in A02 on the other hand, it won´t start until you´ve actually set an trig in the sequencer to start play that sample (regardless of what loop setting it got).

/mike