Credit usage for /video/generate doesn't match the docs

Starting with full quota (600, equivalent to 10 credits) on the free plan, I generated an avatar video that was 12 seconds long. After the video, the API usage for my account said that the video used 1.27 credits. The new API quota was 524, so it reduced the quota by 76. Since 1.27 * 60 = 76, that lines up.

However, the docs says /video/generate (Video Avatar) should use 2 credits / minute, charged in 30 second increments. I believe Video Avatar is "avatar" in the request configuration, and Photo Avatar is "talking photo," but I could be wrong. So, since the video was less than 30 seconds, I would expect to have burned 1 credit, and quota would be reduced by 60. On January 24th, when I last ran a test, each video used 0.5 credits according to the API usage page, so maybe this is still a Photo Avatar.

This is my usage history, all using the same request: https://imgur.com/Ac6B4w8

However, today, it now looks like the credit usage is now (Video Duration in seconds) / 60 * 6. That is the pricing for /video_agent/generate. Is the pricing in error, or did something change in the rates?