We use a transparent background colour as a chroma key for titles etc. However when using a horizontal wipe transition, the specified transparency colour also gets wiped which upsets the keying. Why does this happen for a wipe transition but not for others? Can it be prevented? See attached file for a single frame from the transition. Pure green is the colour our video switcher is expecting as the chroma key.
Is this the expected behaviour or a bug? Very surprised that a wipe transition impacts the transparent colour like this.