Can attest to this, based on my experience in April of last year.

I was questioned extensively (albeit with much courtesy) at Macau airport, by Air Macau when presenting for check-in for my flight to Chengdu, which also is included in the TWOV arrangement. After about 30 minutes of to-ing & fro-ing by various personnel, I was eventually given a boarding pass.

There was then a delay on my arrival at Chengdu whilst immigration officers checked their files/ book of rules etc, gabbled amongst themselves, and questioned me about my proposed stay ; but I was then allowed to proceed, after what I felt was only minor hassle.