I presume the ECU is not reporting any issues in VCDS?
I think the ECU can switch the injectors as part of its output tests (although not sure how it would mitigate residual fuel pressure flooding a cylinder if an injector is opened?). If it will, then you should be able to hear them clicking in turn. If not then it does seem likely the LPG ECU is not relinquishing control of them. Do you have diagnostic software for the LPG ECU?
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