If this is a file type plugin like a drm removal plugin it is run automatically when adding, you cant run it manually using -r (-r is for plugins that explicitly provide an actual CLI of their own).
You wont get any debug information for a segfault unless you run the program under gdb or use something like echo bt | coredumpctl gdb
But even then since most binaries have debug information stripped on Linux, you wont get very useful backtraces.
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