My custom block incorrectly throws the error: "No transformer found for component: [Custom Components ID]. Cannot downgrade from modern slice to legacy component" when using custom components. The block's format_version is 1.26.20.
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I am getting the same error in Preview 26.20.23. It does not appear in Release 26.12 using the same Add on. I am using block format 1.26.0
I seem to get the error when I use custom components within permutations.
After a little more experimentation, I discovered that in my case, it was the use of “onPlayerInteract” that was causing the error to appear.
I have 3 custom components, one uses “onPlayerInteract”, but the error appears once for each custom component and for every block that uses it. If I swap this for another event, e.g. “onStepOn” then I have no errors.
Please attach an example add-on that can be used to reproduce the issue to this report.