It happens with the current test version, yes. I didn't have any existing modifiers to test with, I was trying to create a new one but opening the settings triggered a freeze.
Very strange behaviour: I created an empty library that copied my existing structure, including saved searches. Everything worked here, creating a new modifier and then opening the settings again. When switching back to my main library, it also worked there.
But then when restarting Calibre, I get freezes until I switch to my test library and back.
Weird, but at least it provides a workaround.
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