You'd be surprised. RPGM doesn't really expect you to modify the game files, and especially the plugins can use some very strange (ie. very bad) ways of coding things that don't break under normal use but are extremely fragile and unpredictable when they break. I've had spaces in the wrong place cause issues and lock out gameplay features without causing a termination error. An empty parameter field that caused a crash only if you entered a certain map and interacted with a specific object. You can kind of see it in how much of a mess plugins.js is, but there are a lot of ways things can go wrong. The missing bracket idea is mostly a thought I had regarding something in the game files that passes a text string to a plugin, it would be escaped as it's in a text string so not cause a broader failure, but the plugin wouldn't know how to handle it, fail quietly, and do nothing.
Either way, I was hoping that simple file substitution would at least narrow down where the error is, but you are probably right that the issue is more fundamental.
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