UE5.5 preview: BP debugging issues

When setting breakpoints in a Blueprint class’ tick function, I’m getting “Enter Debugging mode failed” when the breakpoint is hit, being unable to debug them. The BP debugger is non-functional for the entire editor session thereafter, I need to restart it to get it working again. Breakpoints in other functions appear to be working perfectly fine.

I was able to consistently reproduce this in widget blueprint classes.

When manually stepping over the “return” in SlateApplication.cpp line 3708, then the tick breakpoint hits fine. See screenshot:

Does anyone else observe this behaviour? It makes BP debugging rather impossible in 5.5.

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Yes, I get this too. It’s been happening since 5.4. Here is the issue Unreal Engine Issues and Bug Tracker (UE-217891) which Unreal has kindly stated that they WONT FIX. And you’re right, it makes bp debugging impossible. They’d rather prioritize some worthless rendering features than making the engine usable.