This recent news piece (1:25 - 8:02) covers the Type 726, most of which we've seen before, but this is an expanded coverage on PLAN's amphibious assault platforms and crafts, including Type 726 LCAC, Zubr-class LCAC, ZTD-05, LPD 071. Some interesting information disclosed in the video: 1) the first Type 726 was commissioned in December 2019 and 2) PLAN Marines was elevated into a Corp-level branch within PLAN in March 2017.
My interpretation of 1) is that they have finally resolved some long-lasting issues (likely associated with the engine) and PLAN has agreed to commission Type 726 officially even though many of them have been under trial and testing for many years. This also partly explains why we're seeing many very public coverage of it lately.