decodebin3: stream switch error with multiple stream changes at a time

In a below test scenario, when application try to set new stream information on decodebin3, the video decode path never be configured.

• test content : one video track + multi audio track
• test env : linux with the latest master branch (1.15.2)
• Test scenario
  • step 1: send a select-streams event to disable video track, it means this event includes only audio tracks's stream-id.
  • step 2: send a select-steams event to enable video track + change audio track

I have attached log file with decodebin:6. decodebin3_log.zip