Differently render after v10.5.11 when using knockout data-bind attributes in dom

[cywhale]

I have an webapp on preactjs and use knockout.js for appearance of imagery layers' ordering and some other attributes. When upgraded to the newest Preact version, it not work any more. I simplified my control and reproduce this problem in codesandbox:

https://codesandbox.io/s/preacttestknock02-xdhpq?file=/src/index.js

When setting preact version as 10.5.10 (in package.json, as this link currently shown), everything is ok. There are 3 testing "nodes" (in this case: test1, test2, test3), and can be raised/lowered.
But if it change to 10.5.11/10.5.12, there will be an additional dummy node. Seems the procedure of create elements and compare difference of children changed after v10.5.11 when I debug my app on chrome.

I'm not sure I use preactjs properly in such way, and any comments would be appreciated if there is any possible way, alternatives, or hints to fix it. Thanks.

[cywhale]

I just found a simple solution: use render() when knockout track got its viewModel, and then applyBindings() to it. Cheer to upgrade finally ^^